JPH06258996A - Hologram - Google Patents

Abstract

PURPOSE:To provide a hologram which is light in weight and is excellent in moisture resistance, solvent resistance and wear resistance. CONSTITUTION:The surface of a hologram layer 5 in which a desired image is recorded is covered with an ordinary temp. glass 1 which is chemically bonded with the hologram layer surface by hydrolysis and dehydration-condensation reaction. The ordinary temp. glass forms a glass thin film by subjecting a hydrolyzable organic metallic compound to hydrolysis and dehydrationcondensation in a reaction soln. in the presence of B<3> (boron ion) by adding a halogen ion as a catalysis. When the hologram layer 5 is stuck to a substrate 92 with an adhesive, the surface of the substrate 92 or the exposed surface of the adhesive is preferably covered by the ordinary temp. glass 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hologram which is lightweight and has excellent moisture resistance, solvent resistance and abrasion resistance.

[0002]

2. Description of the Related Art A hologram is a hologram in which a desired image is recorded by causing an object beam and a reference beam to interfere with each other. As shown in FIG. 13, the hologram includes a glass substrate 92 and a hologram layer 5 adhered and fixed to the surface of the glass substrate 92. The hologram layer 5 is
Dichromated gelatin, silver salt, photopolymer, etc. are used. Dichromated gelatin and silver salts are solidified by gelatin. Photopolymers and the like are solidified by organic polymers and the like.

By the way, the image recorded on the hologram layer 5 has a property of disappearing when it comes into contact with moisture, moisture in the atmosphere, an organic solvent or the like. Also, the hologram layer is
It is a thin layer and is easily damaged. Therefore, a cover glass 99 is provided on the surface of the hologram layer 5 via the optical adhesive 7.

In manufacturing the hologram 9,
First, the hologram layer 5 on which information is recorded is attached to the optical adhesive 7
It is attached to the glass substrate 92 by. Then, these are heated in an oven to evaporate water and organic solvent.
Next, the surface of the hologram layer 5 is covered with a cover glass 99 using the optical adhesive 7. Then, the optical adhesive 7 is cured. Thereby, the hologram 9 is obtained.

[0005]

However, the conventional hologram 9 has the following problems. That is, the cover glass 99 is heavy, difficult to process, and easily broken.
Also, from the viewpoint of requiring sufficient physical strength and ease of use,
The cover glass 99 needs to have a thickness of at least 1 mm.
Therefore, the hologram 9 as a whole becomes thick. Further, the cover glass 99 has a thermal expansion coefficient different from that of the hologram layer 5, and thus is easily peeled off.

Therefore, instead of the glass substrate 92,
It is conceivable to use a resin substrate that is lighter than a glass substrate. The resin substrate has the characteristics that it is originally easy to process and does not easily crack. For the resin substrate, a resin material such as polycarbon or acrylic is used. However, the resin substrate has lower moisture resistance, abrasion resistance, and solvent resistance than the glass substrate. Therefore, there is a possibility that moisture or an organic solvent may penetrate into the hologram layer attached to the resin substrate and the hologram recorded in the hologram layer may disappear.

Further, the hologram layer 5 is covered with a cover glass 99.
At the time of sticking to, the optical adhesive 7 is used, and this is heated to evaporate water and organic solvent. Therefore, air bubbles may enter between the hologram layer 5 and the cover glass 99. This bubble causes a deviation in the traveling direction of the light with which the hologram 9 is irradiated.

Therefore, when the hologram 9 is irradiated with light, the reproduced image of the hologram is distorted. In view of such conventional problems, the present invention aims to provide a lightweight hologram having excellent moisture resistance, solvent resistance, and abrasion resistance.

[0009]

According to a first aspect of the present invention, in a hologram having a hologram layer on which a desired image is recorded, the surface of the hologram layer is chemically bonded to the surface of the hologram layer by hydrolysis or dehydration condensation reaction. It is a hologram characterized by being covered with room temperature glass. What is most noticeable in the first invention is that the surface of the hologram layer is coated with the special room temperature glass.

The normal temperature glass has excellent moisture resistance and solvent resistance. Further, the room temperature glass has a pencil hardness of 4H to 5H after the film is formed, and is not easily scratched or worn. The thickness of the glass film of normal temperature glass is generally 0.
It is preferably 1 to 100 μm. If it is less than 0.1 μm, the adhesive strength may be weakened. On the other hand, if the thickness exceeds 100 μm, it may not be possible to reduce the weight of the hologram.

The room temperature glass is a halogen ion (catalyst) in the presence of B ³⁺ (boron ion), for example, B (OC ₂ H ₅ ) _{3 in} the reaction solution of a hydrolyzable organometallic compound. F ⁻ , Cl ^−, etc.) are added, and hydrolysis and dehydration condensation are performed to form single and multi-component metal oxide films, for example, glass thin films.

The above-mentioned organometallic compound is represented by the general formula Si
An alkoxysilane represented by (OR) ₄ or SiRn (OR) _4-n , or a low condensate obtained by partially hydrolyzing an alkoxide system is industrially easily available.
It is preferable to use one kind or a mixture of two or more kinds.
R in the above general formula is an alkyl group, such as a methyl group, an ethyl group (Et), a normal propyl group (nP
r), lower alkyl groups such as isopropyl group (iPr) and butyl group (Bu) are preferred. Hereinafter, "R" is used with the same meaning.

The organometallic compounds include lithium ethylate [Li (O-Et)], niobium ethylate [Nb (O-Et) ₅ ], magnesium isopropylate [Mg (O-iPr) ₂ ], aluminum isopropylate. [Al (O-iPr) ₃ ], zinc normal propylate [Zn (O-nPr) ₂ , Zn (O-nPr)]
₄ ], titanium isopropylate [Ti (O-iP
r) ₄ ], barium ethylate [Ba (OE)
t) ₂ ], barium isopropylate [Ba (O-iP
r) ₂ ], boron ethylate [B (O-Et) ₃ ], lanthanum normal propylate [La (O-nP]
r) ₃ ], yttrium normal propylate [Y (O
-NPr) ₃ ], lead isopropylate [Pb (O-iP
r) ₂ ] and the like can also be used.

The organometallic compound is hydrolyzed and dehydrated and condensed in a reaction solution in which B ³⁺ , a halogen ion as a catalyst, and a solvent are uniformly mixed to produce a normal temperature glass. Then, in order to facilitate control of the reaction, it is preferable to dilute the concentration of the organometallic compound in the reaction liquid to 70 wt% or less, particularly 5 to 70 wt% with a diluting liquid.

The diluting liquid is not particularly limited as long as it can dissolve the hydrolyzable organometallic compound and can uniformly mix water at a constant ratio.
As such a diluting solution, it is possible to use a readily available diluting solution such as methanol, ethanol, i-propanol, n-
Alcohols such as propanol, butanol, ethylene glycol and propylene glycol are preferably used. As the diluting liquid, a mixed solvent of butanol, cellosolve, and butyl cellosolve, a mixed solvent of xylene and cyclohexane, or the like can be used.

The solvent used for the reaction liquid of the room temperature glass may be any solvent which can dissolve water and the above-mentioned organometallic compounds and can be uniformly mixed with water. Generally, lower aliphatic alcohols such as methanol, ethanol, propanol, isopropanol, butanol, isobutanol, ethylene glycol, propylene glycol, and mixtures thereof are preferably used. Further, a mixed solvent such as butanol + cellosolve + butyl cellosolve, or xylol + cellosolve acetate + methyl isobutyl ketone + cyclohexane can also be used.

As the boron ion, B (OC ₂ H
₅ ) Use ₃ etc. Halogen ions include single ions or composite ions such as F ⁻ (fluorine ion) and Cl ⁻ (chlorine ion). Halogen ions, in the reaction solution,
It is obtained by adding a compound capable of generating the above halogen ion. Examples of the compound capable of generating the halogen ion include ammonium hydrogen fluoride (NH ₄ F · H)
F), NaF, NH ₄ Cl and the like are preferable.

As a method for uniformly coating the surface of the hologram layer with the above-mentioned normal-temperature glass reaction solution, dip coating,
There are methods such as spinner coating. For the hologram layer, dichromated gelatin, silver salt, photopolymer, etc. are used.
Dichromated gelatin and silver salts are solidified by gelatin. Photopolymers and the like are solidified by organic polymers and the like.

Next, when the surface of the hologram layer is coated with the above special room temperature glass, its reaction mechanism is considered as follows. As an example, tetraethoxysilane as a hydrolyzable organometallic compound, HF as a halogen ion, NH ₄ OH as a solvent, Al (NO ₃ ) ₃
The case of using will be described.

That is, when the surface of the hologram layer is coated with a reaction liquid of room temperature glass, tetraethoxysilane [Si (OC ₂ H ₅ )] in the reaction liquid is first hydrolyzed (reaction formula) to be hydroxylated. The product [Si (OH) ₄ ] is produced. Then, the hydroxide is dehydrated and condensed (reaction formula)
As a result, room temperature glass [SiO ₂ ] is produced. Si (OC ₂ H ₅ ) ₄ + 4H ₂ O → Si (OH) ₄ + 4C ₂ H ₅ OH ... Si (OH) ₄ → SiO ₂ + 2H ₂ O ...

More specifically, tetraethoxysilane [Si (OC ₂ H ₅ ) ₄ ] as a hydrolyzable organometallic compound is hydrolyzed in the reaction solution, and a halogen ion [HF] is added thereto. Then, the intermediate [SiF ₆ ²⁻ ] is generated as shown in the reaction formula. Then, when the solvent is evaporated by heating at a low temperature or the like, a reaction such as a reaction formula or the like proceeds to form a glass film.

That is, the intermediate [SiF ₆ ²⁻ ] reacts with the metal ion [Al (NO ₃ ) ₃ ] to form the normal temperature glass [Si].
O ₂ ] is generated (reaction formula). The intermediate also reacts with ammonia [NH ₄ OH] to form normal temperature glass [SiO ₂ ] (reaction formula). Further, the above intermediate is a hydroxyl group [OH
^- ] And dehydration condensation (reaction formula).

Si (OC ₂ H ₅ ) ₄ + 6HF → SiF ₆ ^2- + 2H ⁺ + 4C ₂ H ₅ OH ... 2Al (NO ₃ ) ₃ + 2H ₂ O + SiF ₆ ^2- + 2H ⁺ → 2AlF ₃ + 6HNO ₃ + SiO ₂・ ・ ・ 4NH ₄ OH + SiF ₆ ²⁻ + 2H ⁺ → 4NH ₄ F + 2HF + 2H ₂ O + SiO ₂ ··· 4H ⁺ + 4OH ⁻ + SiF ₆ ^{2 −} + 2H ⁺ → SiO ₂ + 2H ₂ O + 6HF

As a result of the above reaction, as shown in FIG. 2A, the hydroxyl group [OH ⁻ ] on the surface of the hologram layer 5 and the intermediate [SiF ₆ ²⁻ ] of normal temperature glass are chemically bonded. Then, by heating this at a low temperature and drying it, as shown in FIG.
As shown in (b), water [H ₂ O], hydrogen fluoride [H]
F] is evaporated. As a result, a glass film of room temperature glass firmly bonded to the hologram layer 5 is formed.

Next, a second invention according to the present application is a hologram comprising a hologram layer on which a desired image is recorded and a substrate provided with the hologram layer, wherein the surface of the hologram layer and the substrate is hydrolyzed, The hologram is characterized in that it is coated with room temperature glass that chemically bonds to the surface of the hologram layer or the substrate by a dehydration condensation reaction.

What is most noticeable in the second aspect of the invention is that the hologram layer and the substrate are covered with room temperature glass that chemically bonds to the surface of the hologram layer or the substrate.

As the substrate, a glass substrate or a resin substrate such as an optical resin substrate or a thermosetting resin substrate is used.
Examples of the resin substrate include a polycarbon substrate and an acrylic substrate. The shape of the substrate is not particularly limited, but may be a flat plate shape, a prism shape, a lens shape, a grating shape or the like. The optical characteristics of the hologram include a transmission type and a reflection type. Generally, in the case of the transmissive type, the hologram layer is transparent and the substrate is transparent, while in the case of the reflective type, the hologram layer is transparent and the substrate is black.

When a resin substrate is used as the substrate, it is preferable that the entire surface of the resin substrate is covered with room temperature glass which is chemically bonded to the surface of the substrate by hydrolysis and dehydration condensation reaction. This makes it possible to impart moisture resistance, solvent resistance, and abrasion resistance to the substrate.

Both sides of the hologram layer may be sandwiched by substrates, and these may be adhered by an optical adhesive. This can prevent moisture and solvent from entering the hologram layer and prevent the hologram layer from being worn.

Further, a different material such as a polymer material may be interposed between the hologram layer and the room temperature glass in order to prevent cracks due to thermal expansion. Others,
It is similar to the first invention.

A third invention according to the present application is a hologram comprising a hologram layer on which a desired image is recorded and a substrate provided with the hologram layer, wherein both sides of the hologram layer are sandwiched by the substrates. , A hologram characterized in that these are adhered by an optical adhesive, and the exposed surface of the optical adhesive is covered by a room temperature glass which chemically bonds with the optical adhesive by hydrolysis and dehydration condensation reaction. is there.

What is most noticeable in the third invention is that both sides of the hologram layer are sandwiched by substrates, that the hologram layer and the substrate are adhered by an optical adhesive, and the optical adhesive is That is, the exposed surface of is covered with normal temperature glass. Others are the same as the above-mentioned second invention.

In the first to third inventions, the surface of the hologram layer may be covered with a protective layer, and normal temperature glass may be coated on the protective layer. As a result, the hologram is further excellent in moisture resistance, solvent resistance, and abrasion resistance. As the protective layer, a photo-curing type or a thermosetting type coating agent is used.

[0034]

In the first invention, the special room temperature glass covering the hologram layer has excellent moisture resistance, solvent resistance and abrasion resistance. Therefore, the room temperature glass prevents moisture, solvent and the like from entering the hologram layer and protects it from damage and abrasion.

Therefore, the hologram of the present invention is excellent in moisture resistance, solvent resistance and abrasion resistance. The normal temperature glass undergoes the above series of reactions at about 100 ° C. Therefore, at the same time as this reaction, water and organic solvent in the hologram layer can be evaporated.

Further, in the present invention, a liquid reaction liquid of room temperature glass is applied to the surface of the hologram layer. Therefore, both have good wettability and high adhesion. Therefore, no bubbles are generated between the hologram layer and the room temperature glass. Therefore, a hologram with few bubbles can be obtained. Also, according to the present invention, it is not necessary to use an optical adhesive or a cover glass. Therefore, the wrinkles seen in the use of the optical adhesive do not occur.

Further, the thickness of the cover glass becomes unnecessary.
Further, the glass film of normal temperature glass is much thinner than the cover glass of the conventional example. Therefore, the weight of the hologram can be reduced. Further, according to the normal temperature glass, since the cover glass for moisture resistance treatment used in the past is not required, the glass film can be easily formed on the surface of the substrate having a special shape.

In the second invention, the hologram layer and the substrate are coated with the room temperature glass having the above-mentioned excellent properties. Therefore, the hologram according to the present invention is lightweight and has excellent moisture resistance, solvent resistance, and abrasion resistance as in the first invention.

In the third invention, the hologram layer and the substrate are adhered by an optical adhesive. The exposed surface of the optical adhesive is covered with a glass film formed by chemically bonding with the room temperature glass. Therefore, the room temperature glass not only prevents moisture and solvent from entering the optical adhesive, but also protects the optical adhesive from damage and abrasion.

On the other hand, the hologram layer is covered on both sides with substrates. Therefore, the hologram layer protected by the optical adhesive and the substrate is not affected by moisture, solvent and the like. Also, it is not damaged or worn. Therefore, the hologram of the present invention is lightweight and excellent in moisture resistance, solvent resistance, and abrasion resistance.

Further, the hologram according to the first to third inventions is applied as an embossed hologram, a Lippmann hologram, a Fresnel hologram, etc. for preventing forgery of a credit card or the like by inserting a hologram layer into a printed matter. Can also be used.

Since these hologram layers use gelatin, organic polymers, etc., they are vulnerable to solvents and scratches.
By covering the surface of the hologram layer or the substrate made of paper, polymer or the like with normal temperature glass, the moisture resistance and the solvent resistance can be improved, and the abrasion resistance is also improved. As described above, according to the present invention, it is possible to provide a hologram which is lightweight and has excellent moisture resistance, solvent resistance, and abrasion resistance.

[0043]

【Example】

Example 1 The hologram of this example will be described with reference to FIGS. As shown in FIG. 1, the hologram 9 of this example has a hologram layer 5 on which a desired image is recorded, provided on the surface of a glass substrate 92 as a substrate, and the surface of the hologram layer 5 is hydrolyzed and dehydrated. It is covered with a room temperature glass 1 which is chemically bonded to the surface of the hologram layer 5 by a condensation reaction.

The normal temperature glass 1 is a hydrolyzable organometallic compound in a reaction solution, which is hydrolyzed by adding F ⁻ (fluoride ion) as a catalyst in the presence of B ³⁺ (boron ion). The glass film is formed by dehydration condensation. The hardness of the glass film is 4H to 5H in terms of pencil hardness and has damage resistance and wear resistance.

The organometallic compound is hydrolyzed and dehydrated and condensed in a reaction solution in which B ³⁺ , F ⁻ , and a solvent are uniformly mixed to prepare the normal temperature glass 1. The hologram layer 5 is gelatin on which a hologram is recorded. This is a hologram recorded on dichromated gelatin, followed by washing away the dichromate, followed by dehydration with isopropyl alcohol.

The refractive index of light of the room temperature glass 1 and the hologram layer 5 is close to the refractive index of the glass substrate 92 (n ₀ = 1.52). The hologram 9 is a reflection type, and the glass substrate 92 and the room temperature glass 1 are transparent. Hologram layer 5
The glass substrate 92 and the glass substrate 92 are bonded by an acrylic adhesive.

Next, a method for producing the normal temperature glass will be described. First, zirconium: tetrabutoxide: Zr
(OBu) ₄ in a weight ratio of 5: 1 (solvent), water + methanol + ethanol + isopropanol (hereinafter referred to as H ₂
O + MeOH + EtOH + i-PrOH)
= 1: 1: 1: 4.

Then, triethoxyborane B (OEt) ₃ was further added to this mixture at a rate of 0.2 mol / kg, and dissolved by stirring for 10 minutes. As a result, a reaction solution containing the metal oxide and B ⁺ was prepared. I in this reaction solution
The concentration of Zr (OBu) _{4 with} respect to —PrOH is 70
(Weight)% (20% as ZrO ₂ ).

On the other hand, ammonium fluoride NH ₄ F.HF was used as the halogen ion source, and the F ⁻ concentration was 0.1 mol / mol based on the total weight of the reaction solution and the same mixed solvent.
It was prepared to be kg. Thereby, a catalyst was obtained.
Next, the reaction liquid prepared as described above and the catalyst were mixed at a weight ratio of 3: 1 and stirred for 10 minutes. Next, the pH of the mixed solution was adjusted to 5.0 (using an ethanol solution of methyl red + bromocresol green as an indicator) using hydrochloric acid and aqueous ammonia. After that, this 3
After aging for a while, hydrolysis and dehydration condensation were performed to obtain a room temperature glass reaction solution.

Regarding the boron used in the reaction, when it is contained as a B ₂ O ₃ component in the design composition of the obtained metal oxide, the calculated amount of the organoboron compound according to the content is added as it is. A normal temperature glass may be produced. Further, when it is desired to remove boron, if boron is evaporated as boron methyl ester and removed by heating in the presence of methanol as a solvent or by immersing in methanol and heating after film formation.

As a method for applying the reaction liquid of the room temperature glass 1 to the hologram layer 5, a dip coating method was used. After coating, the film was dried at low temperature at 100 ° C. for 20 minutes to form a room temperature glass film. The thickness of this glass film is about 10μ
It was m. The glass substrate 92 has a flat plate shape.

Next, the function and effect of this example will be described.
In the hologram 9 of this example, the surface of the hologram layer 5 is covered with a special room temperature glass 1. Therefore, a strongly bonded glass film is formed on the surface of the hologram layer 5. Further, the room temperature glass 1 has excellent moisture resistance and solvent resistance. Therefore, the room temperature glass 1 covering the hologram layer 5 is
It prevents moisture, organic solvent and the like from entering the hologram layer. Therefore, the hologram of this example is excellent in moisture resistance and solvent resistance.

Liquid hologram glass 1 is applied to the surface of hologram layer 5. Therefore, both have good wettability and high adhesion. Therefore, no bubbles are generated between the hologram layer 5 and the room temperature glass 1. Therefore, the hologram 9 with few bubbles can be obtained.

Further, since the room temperature glass 1 is used for bonding the hologram layer 5 and the glass substrate 92, it is not necessary to use an optical adhesive or a cover glass. Therefore, the wrinkles seen in the optical adhesive do not occur. Also, normal temperature glass 1
The glass film made of is much thinner than the conventional cover glass. Therefore, it is possible to reduce the weight of the hologram 9.

Further, as shown in FIG. 3, the hologram layer 5
It is also possible to peel this from the glass substrate 92 and cover the entire surface of the hologram layer 5 with the room temperature glass 1. As a result, the hologram 9 becomes the hologram layer 5
With only the normal temperature glass 1, it is possible to further reduce the weight and the thickness.

Example 2 In the hologram of this example, as shown in FIG. 4, a polycarbon resin substrate 91 is used as a substrate. Further, not only the hologram layer 5 but the entire surface of the resin substrate 91 is covered with the room temperature glass 1. The normal temperature glass 1 is chemically bonded to the surfaces of the hologram layer 5 and the resin substrate 91 by hydrolysis and dehydration condensation reaction. Others are the same as in the first embodiment.

In this example, the resin substrate 91 which is lighter than the glass substrate is used. Therefore, the hologram of this example is even lighter than that of the first embodiment. Further, although the resin substrate 91 is weak in moisture resistance, solvent resistance, and abrasion resistance,
The entire surface is covered with the room temperature glass 1. Therefore, excellent moisture resistance, solvent resistance, and abrasion resistance can be secured.

As shown in FIG. 5, the glass substrate 92 may be used as the substrate, and the hologram layer 5 and the glass substrate 92 may be entirely covered with the room temperature glass 1. Also in this case, the hologram layer 5 can maintain sufficient moisture resistance. In addition, also in this example, the first embodiment
The same effect as can be obtained.

Example 3 In the hologram 9 of this example, as shown in FIG. 6, a different material 6 is interposed on the surface of the hologram layer 5, and the surface of the different material 6 is covered with the room temperature glass 1. The surface of the resin substrate 91 is also covered with the room temperature glass 1. The dissimilar material 6 is formed of a polymer material to form a protective layer. Others are the same as those in the second embodiment.

In this example, since the dissimilar material 6 is interposed between the hologram layer 5 and the room temperature glass 1, there is an effect of preventing cracks due to thermal expansion. In addition, in this example, the same effect as that of the second embodiment can be obtained. In addition,
As shown in FIG. 7, a glass substrate 92 can be used as the substrate.

Example 4 In this example, the hologram of Example 1 was evaluated for water immersion durability. As an evaluation method, the hologram was immersed in water and the disappearance time of the hologram was measured. For comparison, a hologram not coated with normal temperature glass (comparative example) was also evaluated in the same manner as above.
As a result, the hologram according to the first embodiment is 420 minutes (7
(Time), the hologram recorded in the hologram layer disappeared. On the other hand, in the comparative example, the hologram disappeared in a very short time of 3 minutes.

Example 5 As shown in FIG. 8, the hologram 9 of this example comprises a hologram layer 5 on which a desired image is recorded and resin substrates 91 and 91 in which the hologram layer 5 is sandwiched between the upper and lower surfaces thereof. Become.
Both surfaces of the hologram layer 5 are bonded to the resin substrate 91 via the optical adhesive 7. Then, the hologram layer 5
The entire exposed surface of the resin substrate 91 and the optical adhesive 7 is covered with the room temperature glass 1 in a state where the glass substrate is sandwiched. Others are the same as those in the second embodiment. Also in this example, the same effect as in Example 2 can be obtained.

Example 6 As shown in FIGS. 9 and 10, the hologram 9 of this example uses a resin substrate 91 whose entire surface is covered with the room temperature glass 1, whereby the hologram layer 5 is sandwiched. . The room temperature glass 1 and the hologram layer 5 are adhered and fixed by an optical adhesive 7. Others are the same as in the fifth embodiment.

In this example, the room temperature glass 1 is interposed between the resin substrates 91 having a weak adhesion to the hologram layer 5. Therefore, the adhesion between the hologram layer 5 and the resin substrate 91 is good. Further, since the entire resin substrate 91 is coated with the room temperature glass 1 in advance, the moisture resistance is further improved. Besides, in this example, the same effect as that of the fifth embodiment can be obtained.

Further, as shown in FIG. 11, a resin substrate 91 having only one surface coated with the room temperature glass 1 is used, and the hologram layer 5 is sandwiched with the surface on which the room temperature glass 1 is stuck facing inward. Put on the hologram 9 as shown in FIG.
It is also possible to cover the whole with the ordinary temperature glass 1. Also in this case, the same effect as that of the resin substrate 91 whose whole surface is covered with the room temperature glass 1 can be obtained.

Example 7 In the hologram 9 of this example, as shown in FIG. 12, both sides of the hologram layer 5 are sandwiched by glass substrates 92, and these are adhered by an optical adhesive 7. The exposed surface of the optical adhesive 7 that is exposed to the outside is covered with the room temperature glass 1.

The room-temperature glass 1 is formed on the exposed surface of the optical adhesive 7 by hydrolysis and dehydration condensation reaction.
Is chemically bonded to. Others are the same as in the first embodiment. Although the glass substrate 92 is used as the substrate in this example, a resin substrate can also be used.

In this example, the hologram layer 5 and the glass substrate 92 are adhered by the optical adhesive 7. The exposed surface of the optical adhesive 7 is covered with a glass film formed by chemically bonding with the room temperature glass 1. Therefore, the room temperature glass 1 prevents moisture, solvent and the like from entering the optical adhesive 7 and protects the optical adhesive 7 from damage and abrasion.

On the other hand, the hologram layer 5 is covered on both sides with glass substrates 92. Therefore, the optical adhesive 7
And the hologram layer 5 protected by the glass substrate 92
Is not affected by moisture or solvent. Also, it is not damaged or worn. Therefore, the hologram 9 of this example is excellent in moisture resistance, solvent resistance, and abrasion resistance. In addition, also in this example, the same effect as that of the first embodiment can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of a hologram according to a first embodiment.

FIG. 2 is an explanatory diagram showing a reaction adhesion state between a room temperature glass and a hologram layer according to the present invention.

FIG. 3 is a cross-sectional view of the hologram layer according to the first embodiment, the entire surface of which is covered with room temperature glass.

FIG. 4 is a sectional view of a hologram according to a second embodiment.

FIG. 5 is a sectional view of another hologram according to the second embodiment.

FIG. 6 is a sectional view of a hologram of Example 3.

FIG. 7 is a sectional view of another hologram according to the third embodiment.

FIG. 8 is a sectional view of a hologram of Example 5.

FIG. 9 is a sectional view of a hologram of Example 6.

FIG. 10 is a cross-sectional view of a resin substrate according to a sixth embodiment, the entire surface of which is covered with room temperature glass.

FIG. 11 is a cross-sectional view of a resin substrate according to a sixth embodiment, one surface of which is coated with room temperature glass.

FIG. 12 is a sectional view of a hologram of Example 7.

FIG. 13 is a sectional view of a conventional hologram.

[Explanation of symbols]

 1. ． ． Normal temperature glass, 5. ． ． Hologram layer, 6. ． ． Different materials, 9. ． ． Hologram, 91. ． ． Resin substrate, 92. ． ． Glass substrate,

Front Page Continuation (72) Inventor Suuma Matsui 1-1, Showa-cho, Kariya City, Aichi Prefecture, Nihon Denso Co., Ltd. (72) Inventor Toshinori Morimi 2-26-12 Hazawa, Nerima-ku, Tokyo

Claims (4)

[Claims] 1. A hologram having a hologram layer on which a desired image is recorded, wherein the surface of the hologram layer comprises:
A hologram characterized by being coated with room temperature glass that chemically bonds to the surface of the hologram layer by a hydrolysis and dehydration condensation reaction. 2. A hologram layer on which a desired image is recorded,
A hologram comprising a substrate provided with the hologram layer, characterized in that the surface of the hologram layer and the substrate is covered with room temperature glass which is chemically bonded to the surface of the hologram layer or the substrate by hydrolysis and dehydration condensation reaction. Hologram to do. 3. The substrate according to claim 2, wherein the substrate is a resin substrate, and the entire surface of the substrate is covered with room temperature glass that chemically bonds with the surface of the substrate by hydrolysis and dehydration condensation reaction. And hologram. 4. A hologram layer on which a desired image is recorded,
In a hologram including a substrate provided with the hologram layer, both surfaces of the hologram layer are sandwiched by substrates, and these are adhered by an optical adhesive, and the exposed surface of the optical adhesive is A hologram characterized by being coated with room temperature glass that chemically bonds to an optical adhesive by a hydrolysis and dehydration condensation reaction.