JPH0836351A - Hologram-encapsulating glass - Google Patents

Abstract

PURPOSE:To provide hologram-encapsulating glass having excellent moistureproofness and high diffraction efficiency. CONSTITUTION:This hologram-encapsulating glass is formed by encapsulating the hologram 2 between first glass 61 and second glass 62. The hologram 2 is coated with a moistureproof layer 1 for preventing infiltration of moisture over the entire surface thereof. This moistureproof layer 1 which has no optical rotatary power is preferable. The moistureproof layer 1 is preferably a coating film formed by applying a moistureproofing agent. The one side of the hologram 2 of the moistureproof layer l may be the coating film and the other side may be a moistureproof film. Encapsulation of the hologram 2 is executed by using, for example, an optical adhesive 5. An intermediate layer for enhancing adhesive power is preferably disposed between the moistureproof layer 1 and the optical adhesive 5. The moistureproof layer 1 is a rubber resin, polyvinyl chloride synthetic resin, etc. The optical rotatory degree of the moistureproof layer 1 is preferably <=37 deg..

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hologram enclosing glass used for a hologram head-up display or the like.

[0002]

2. Description of the Related Art In recent years, a head-up display for displaying speed and the like in front of a windshield of an automobile has attracted attention. The head-up display is a hologram enclosed in a windshield glass, which diffracts and reflects incident light relating to a displayed image into reproduction light, and makes the viewer visually recognize the display image by the reproduction light.

In manufacturing this hologram,
For example, a photosensitive material containing dichromated gelatin and a dye is applied to a substrate and dried to form a photosensitive film. The photosensitive film is then exposed to record interference fringes, and then
develop. Then, this hologram is sealed between two windshields with an adhesive. As a result, a hologram-encapsulated glass is obtained.

[0004]

[Problems to be Solved] However, when a hologram absorbs moisture, the diffraction efficiency changes when it is enclosed.
Therefore, the displayed image is distorted and it becomes difficult to reproduce a clear image. Therefore, it is conceivable to coat the photosensitive film with a plastic film in advance.

However, the film is formed by stretching the softened plastic. Therefore, the film has optical rotatory power during the stretching process. When a film having such optical rotatory power is coated on the photosensitive film, the linearly polarized light of the laser light is disturbed by the optical rotatory power of the film at the time of photographing, and the contrast of interference fringes is lowered. Therefore, the diffraction efficiency of the obtained hologram may decrease.

In view of the above-mentioned conventional problems, the present invention is to provide a hologram encapsulating glass which is excellent in moisture resistance and has high diffraction efficiency.

[0007]

According to the present invention, in a hologram encapsulating glass in which a hologram is encapsulated between a first glass and a second glass, the hologram has a moisture-proof layer for preventing moisture from entering the entire surface of the hologram. The hologram encapsulating glass is characterized by being coated with.

What is most noticeable in the present invention is that the entire surface of the hologram is covered with a moisture-proof layer that prevents ingress of moisture. In the present invention, the moisture-proof layer preferably does not have optical activity. As a result, it is possible to suppress a decrease in the diffraction efficiency of the hologram.

The moisture-proof layer is preferably a coating film formed by coating a moisture-proof agent. By this,
The moisture-proof layer can be easily formed, and the manufacturing process can be simplified. Examples of methods for forming the coating film include a spinner method, a dipping method, and a bar coating method.

In the moisture-proof layer, one side of the hologram may be the coating film and the other side of the hologram may be a moisture-proof film. It is preferable that the moisture-proof film has no optical activity for the same reason as above.

The moisture-proof layer is, for example, one or more selected from the group consisting of polyvinyl chloride-based synthetic resin, rubber-based resin, polyolefin-based synthetic resin, acrylic-based resin, epoxy-based resin, and fluorine-based resin. Preferably there is. As a result, it is possible to prevent moisture in the atmosphere from entering the hologram during the sealing operation. Polyvinyl chloride, polyvinylidene chloride, or the like can be used as the polyvinyl chloride-based synthetic resin. As the polyolefin-based synthetic resin, polymethylpentene, polypropylene, or the like can be used. As the rubber-based resin, butyl rubber-based, nitrile rubber-based, acrylic rubber-based, butadiene rubber-based, silicon rubber-based, or the like can be used.

Such a material can be used both when the moisture-proof layer is the above-mentioned coating film and when it is a moisture-proof film. Further, by using the above material, the high diffraction efficiency of the hologram can be maintained as it is.

The moisture-proof layer preferably has adhesiveness. As a result, the hologram can be directly adhered to the surface of the first glass or the second glass without using an adhesive, which facilitates manufacturing. The moisture-proof layer having adhesiveness is preferably an ultraviolet curable synthetic resin. As a result, the first moisture barrier layer is formed without heating.
Alternatively, it can be adhered to a second glass. Therefore, the characteristics of the hologram do not change during bonding.

As the ultraviolet curable synthetic resin, an acrylic resin, an epoxy resin, a urethane resin or the like can be used. Further, the ultraviolet curable synthetic resin may not have adhesiveness. In this case,
The hologram is adhered and fixed to the surface of the first glass with an adhesive layer interposed.

The surface of the moisture-proof layer according to the present invention is preferably subjected to an appropriate surface treatment such as corona discharge treatment, plasma treatment or primer treatment. As a result, the surface of the moisture-proof layer is activated, and the adhesion between the moisture-proof layer and the first or second glass is improved. The moisture-proof layer covers the entire surface of the hologram. This hologram is obtained by exposing and developing a photosensitive material such as dichromated gelatin, dye-sensitized dichromated gelatin, photopolymer, and silver salt photosensitive material.

Next, the optical rotation of the moisture-proof layer is 37 ° or less,
Further, it is preferably 26 ° or less. When the angle is 37 ° or less, the visibility of the hologram encapsulating glass can be 80% or more (see FIG. 29). Further, when the angle is 26 ° or less, the visibility of the hologram enclosing glass can be made 90% or more. Here, the optical rotation θ of the moisture-proof layer
Is the difference in angle between the linearly polarized light A of the reference light that has passed through the moisture-proof layer of the hologram-enclosed glass and the linearly polarized light B of the object light that has passed through the moisture-proof layer of the hologram-enclosed glass (see FIG. 28).

Here, the visibility of the hologram enclosing glass is proportional to the contrast of interference fringes or the diffraction efficiency of the hologram enclosing glass. Therefore, the visibility of the hologram encapsulation glass can be improved by improving the contrast of the interference fringes or by improving the diffraction efficiency of the hologram encapsulation glass. By improving the visibility in this way, the brightness of the display image projected on the hologram encapsulation glass such as the windshield encapsulating the hologram is improved.

Therefore, in order to improve the contrast of interference fringes, the inventors heretofore have made the reference light to the hologram enclosing glass and the linearly polarized light of the object light parallel. However, even if the linearly polarized light of the reference light and the linearly polarized light of the object light are parallel to each other at the time of incidence, the contrast of the interference fringes could not be sufficiently improved.

When the cause was sought after earnestly, it was found that the moisture-proof layer itself covering the hologram has optical rotation characteristics. Furthermore, the optical rotation θ of the moisture barrier is 37 °
The inventor has invented that the visibility of the hologram encapsulating glass can be improved by setting the angle to 26 ° or less.

The hologram covered with the moisture-proof layer is enclosed between the first glass and the second glass. At this time, the hologram can be encapsulated by using an optical adhesive such as polyvinyl butyral resin.

An intermediate layer for increasing the adhesive strength is preferably provided between the moisture-proof layer and the optical adhesive. As a result, the hologram is firmly adhered and fixed to the optical adhesive. Therefore, the hologram can be reliably enclosed between the first glass and the second glass. As the intermediate layer, for example, a room temperature glass-based coating film or a coating film made of a hydrophilic resin can be used.

It is preferable to use, as the first and second glasses, ones having no optical rotatory property in order to improve the diffraction efficiency of the hologram enclosing glass. The shape of the first and second glasses is not particularly limited, such as general flat glass and curved glass. Of course, it may have a curved shape like a windshield of an automobile.

[0023]

In the hologram-encapsulating glass of the present invention, the entire surface of the hologram is covered with a moisture-proof layer that prevents moisture from entering. Therefore, the hologram is protected from moisture.

Further, even if the hologram is exposed to an environment in which moisture easily enters, such as at the time of encapsulation, for example, an environment of high temperature, high pressure, or high humidity, the moisture-proof layer covering the hologram prevents moisture from entering. Therefore, the hologram has high diffraction efficiency without being damaged by moisture. Therefore, the display image projected by the hologram of the present invention is a very bright image. Therefore, according to the hologram enclosing glass of the present invention, a clear image can be reproduced.

Since the hologram covered with the moisture-proof layer is protected from moisture, it is not necessary to cover it with a plastics film as in the conventional case. Therefore, the hologram enclosing glass of the present invention is not affected by the optical rotatory power of the plastics film itself. Therefore, the contrast of the interference fringes of the hologram can be maintained high. Therefore, the hologram enclosing glass of the present invention has high diffraction efficiency.

According to the present invention, it is possible to provide a hologram-encapsulating glass having excellent moisture resistance and high diffraction efficiency.

[0027]

【Example】

Example 1 Regarding a hologram enclosing glass according to an example of the present invention,
This will be described with reference to FIGS. As shown in FIG. 1, the hologram-encapsulating glass 7 of the present example includes a hologram 2 and a hologram
It is enclosed between the glass 61 and the second glass 62. The entire surface of the hologram 2 is covered with a moisture-proof layer 1 for preventing infiltration of moisture.

The moisture-proof layer 1 is a coating film formed by coating a moisture-proof agent and does not have optical activity. As the moisture-proofing agent, a polyolefin-based synthetic resin such as polyolefin or polypropylene, an acrylic-based synthetic resin, a rubber-based resin, or an epoxy-based synthetic resin is used.

The hologram 2 covered with the moisture-proof layer 1 is adhered to the first glass 61 by the adhesive layer 3. The hologram 2 is enclosed between the first glass 61 and the second glass with the optical adhesive 5 interposed. The first and second glasses 61, 62 are slightly curved wind glasses. The optical adhesive 5 is a polyvinyl butyral resin. For the adhesive layer 3, an ultraviolet curable adhesive (FMD207 manufactured by Nippon Loctite Co., Ltd. or 3013B manufactured by Three Bond Co., Ltd.) is used. The hologram enclosing glass 7 is used for a head-up display of an automobile.

Next, a method of manufacturing the hologram enclosing glass 7 will be described with reference to FIGS. First,
The exposure glass 9 is washed with ethanol or the like (FIG. 2),
An exposure adhesive 91 (ultraviolet curable adhesive or gelatin (6 wt%)) is applied to the surface (FIG. 3). next,
As shown in FIG. 4, a base film 92 is attached to the surface of the exposure adhesive 91. As the base film 92, polycarbonate, polyethylene, polyethylene terephthalate or the like can be used (actually 4-35).
No. 402). The refractive index of the base film 92 is 1.52 ± 0.0 to approximate the refractive index of the hologram 2.
It is preferably 4.

Next, as shown in FIG. 5, on the surface of the base film 92, a rubber resin (Humiseal 1B51 manufactured by Chase Corporation), or a polyolefin synthetic resin such as polypropylene, an acrylic synthetic resin,
Alternatively, a moisture barrier such as an epoxy synthetic resin is applied to form the moisture barrier layer 1. The coating method is spinner method,
Either the Dup method or the bar coat method may be used.

Next, as shown in FIG. 6, a photosensitive material is applied to the entire base film 92 including the moisture-proof layer 1 to cover the photosensitive film 20. The photosensitive material is dye-sensitized dichromated gelatin. Further, the photosensitive material may be a photopolymer. Next, the photosensitive film is exposed to laser light,
Develop and form a hologram.

Next, as shown in FIG. 7, A--A in FIG.
The end of the hologram 2 is cut out along the line to make it into a desired size. Then, as shown in FIG.
The same moistureproofing agent as described above is applied to the surface of, to form the moistureproof layer 1. At this time, the moisture-proof layer 1 is formed so as to completely cover the entire surface of the hologram 2 including the end portion. However, if it is not necessary to cover the entire surface of the hologram, such as when water infiltration from the edge of the hologram into the hologram can be ignored during the encapsulation process, a part of the hologram is exposed and covered with a moisture-proof layer. You may.

Next, as shown in FIG. 9, an ultraviolet-curable adhesive layer 3 is formed on the surface of the moisture-proof layer 1. Next, the hologram 2 is peeled off together with the base film 92 from the exposure glass 9 and, as shown in FIG.
The first glass 61 is arranged. Next, the adhesive layer 3 is cured by irradiation with ultraviolet rays, and the hologram 2 is attached to the first glass 61.
Adhere and fix to the surface of.

Next, as shown in FIG. 11, the base film 92 is peeled from the hologram 2. Next, FIG.
As shown in FIG. 5, the end of the moisture-proof layer 1 is cut out along the line BB in the figure. At this time, the hologram 2 is formed by the moisture-proof layer 1.
Leave the entire surface of the sheet covered.

Next, as shown in FIG. 13, a second glass 62 is laminated on the surface of the first glass 61 with an optical adhesive 5 made of polyvinyl butyral resin interposed therebetween to sandwich the hologram 2. . Then, this is heated and pressed. As a result, the polyvinyl butyral resin is melted, and the hologram 2 becomes the first and second glasses 61, 62.
Then, the hologram enclosing glass 7 shown in FIG. 1 is obtained.

Next, the function and effect of this example will be described. In the hologram encapsulating glass 7 of this example, as shown in FIG. 1, the entire surface of the hologram 2 is covered with a moisture-proof layer 1 for preventing infiltration of moisture. Therefore, the hologram 2 is protected from moisture. Further, even if the hologram 2 is exposed in an environment where moisture easily enters, for example, when enclosing at high temperature and high pressure, the moisture-proof layer 1 that covers the hologram 2 prevents moisture from entering. Therefore, the hologram 2 is not damaged by moisture.

Therefore, the hologram 2 can maintain a high diffraction efficiency during and after the encapsulation. Therefore, the hologram enclosing glass 7 can exhibit high diffraction efficiency. The display image projected by the hologram 2 is a very bright image. Therefore, according to the hologram enclosing glass 7 of this example, a clear image can be reproduced.

Further, since the hologram 2 covered with the moisture-proof layer 1 is protected from moisture, it is not necessary to cover it with a plastic film as in the conventional case. Therefore, the hologram enclosing glass 7 of this example is not affected by the optical rotatory power of the plastics film itself. Therefore, the contrast of the interference fringes of the hologram 2 can be maintained high. Therefore, the hologram enclosing glass 7 of this example has high diffraction efficiency.

Further, in the method of manufacturing the hologram enclosing glass of this example, as shown in FIG. 6, the photosensitive film 20 is covered with a moisture-proof layer having no optical rotatory property and exposed by laser light. Therefore, laser light can be passed and reflected in a fixed direction, and interference fringes with high contrast can be recorded. Further, by developing such a photosensitive film, the hologram 2 with high diffraction efficiency can be formed.

Further, as shown in FIG. 13, the entire surface of the hologram is covered with the moisture-proof layer 1 in the sealing step. Therefore, the hologram 2 can maintain high diffraction efficiency even under high temperature and high pressure conditions in the sealing step. Therefore, according to this example, it is possible to stably manufacture the hologram-encapsulating glass with high diffraction efficiency.

Example 2 In the hologram enclosing glass of this example, as shown in FIG. 14, one side of the hologram 2 is covered with the moisture-proof film 10. Further, the other side is covered with the moisture-proof layer 1 similar to that of the above-mentioned first embodiment. The hologram 2 is adhered to the first glass 61 by the adhesive layer 3. The hologram 2 is enclosed between the first glass 61 and the second glass 62 by using the optical adhesive 5.

Next, a method of manufacturing the hologram enclosing glass will be described with reference to FIGS. First,
As shown in FIG. 15, the moisture-proof film 10 is attached to the surface of the base film 92. The moisture-proof film 10 is a film having no optical rotatory property, for example, a film produced so as not to be stressed.

For the moisture-proof film 10, a polyvinyl chloride-based synthetic resin such as polyvinyl chloride or polyvinylidene chloride, or a polyolefin-based synthetic resin such as polyolefin or polymethylpentene is used.
No. 2).

Next, the exposure glass 9 is washed with ethanol (FIG. 16), and the exposure adhesive 91 (ultraviolet curing type, gelatin) is applied to the surface thereof (FIG. 17). Next, as shown in FIG. 18, the base film 92 covered with the moisture-proof film 10 is attached to the surface of the exposure adhesive 91. Next, as shown in FIG. 19, the moisture-proof film 1
A photosensitive material is applied to the entire surface of the base film 92 including the surface of the photosensitive film 20 to cover the photosensitive film 20. Next, the photosensitive film 20 is exposed to laser light and developed to form the hologram 2.

Next, as shown in FIG. 20, C- in FIG.
The end of the hologram 2 is cut out along the line C to obtain a desired size. Next, as shown in FIG. 21, the same moistureproofing agent as described above is applied to the surface of the hologram 2 to form the moistureproof layer 1. At this time, the moisture-proof layer 1 is formed so as to completely cover the entire surface of the hologram 2 including the end portion. However,
Regarding the end portion of the hologram 2, the hologram 2 may be left exposed if unnecessary.

Next, as shown in FIG. 22, the moisture-proof layer 1 is
An ultraviolet curable adhesive layer 3 is formed on the surface of the. next,
The hologram 2 is peeled from the exposure glass 9 together with the base film 92, and the first glass 61 is provided on the surface of the adhesive layer 3 as shown in FIG. After that, the adhesive layer 3 is cured by irradiation of ultraviolet rays, and the hologram 2 is adhered and fixed to the surface of the first glass 61. Next, the exposure glass 9 is peeled off from the base film 92, and the base film 92 is peeled off from the hologram 2 as shown in FIG.

Next, as shown in FIG. 25, the second glass 62 is laminated on the surface of the first glass 61 with the optical adhesive 5 made of polyvinyl butyral resin interposed, and the hologram 2 is sandwiched. . Then, this is heated and pressed. As a result, the polyvinyl butyral resin is melted, and the hologram 2 becomes the first and second glasses 61, 62.
Then, the hologram enclosing glass 7 is obtained. Others are the same as in the first embodiment.

Next, the function and effect of this example will be described. In this example, as shown in FIG. 14, one side of the hologram 2 is covered with the moisture-proof film 10, and the other side is covered with the moisture-proof layer 1 formed by coating. The moisture-proof film 10 and the moisture-proof layer 1 both prevent moisture from entering and have no optical rotatory power. Therefore, as in Example 1, it has excellent moisture resistance,
It is possible to obtain a hologram-encapsulating glass with high diffraction efficiency.

Example 3 In the hologram enclosing glass of this example, as shown in FIG. 26, the moisture-proof layer 11 has adhesiveness. The hologram 2 covered with the moisture-proof layer 11 has the first glass 6
It is directly glued and fixed to 1. As the moisture-proof layer 11, an ultraviolet curable synthetic resin, for example, 3013B manufactured by ThreeBond Co. is used. The hologram 2 is enclosed between the first glass 61 and the second glass 62 by using the optical adhesive 5 made of polyvinyl butyral resin. Others are the same as in the first embodiment.

In this example, the moisture-proof layer 1 has adhesiveness. Therefore, the hologram 2 can be directly bonded to the first glass 61 without using an adhesive as in the first embodiment. Therefore, the manufacturing process can be simplified. In addition, the same effect as that of the first embodiment can be obtained.

Example 4 In the hologram-encapsulated glass of this example, as shown in FIG. 27, an intermediate layer 8 for increasing the adhesive force is provided between the moisture-proof layer 1 and the optical adhesive 5 by coating. There is. As the intermediate layer 8, for example, normal temperature glass, gelatin, or the same material as the moisture-proof layer can be used. Others are the same as in the first embodiment.

In this example, an intermediate layer 8 for increasing the adhesive force is provided between the moisture-proof layer 1 and the optical adhesive 5. Therefore, the hologram 2 is firmly adhered and fixed to the optical adhesive 5. Therefore, the hologram 2 can be reliably enclosed between the first glass 61 and the second glass 62. In addition, also in this example, the same effect as that of the first embodiment can be obtained.

Example 5 In this example, the relationship between the optical rotation of the moisture-proof layer and the visibility of the hologram enclosing glass was measured. That is, the optical rotation of the moisture-proof layer was changed in the range of 0 to 90 °, and the visibility of the hologram-enclosed glass at that time was measured.

As shown in FIG. 28, the optical rotation angle θ of the moisture-proof layer means the difference in angle between the linearly polarized light A of the reference light that has passed through the moisture-proof layer and the linearly polarized light B of the object light that has passed through the moisture-proof layer. The visibility of the hologram-encapsulating glass was measured by combining a polarizing film and an optical power meter. The result is shown in FIG.

As is known from the figure, the smaller the optical rotation θ of the moisture-proof layer, the higher the visibility of the hologram encapsulating glass. When the optical rotation of the moisture-proof layer was 37 ° or less, the visibility was 80% or more, and when the optical rotation was 26 ° or less, the visibility of 90% or more was obtained.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a hologram enclosing glass of Example 1.

FIG. 2 is an explanatory diagram of the exposure glass in the method for manufacturing the hologram-encapsulating glass of Example 1.

FIG. 3 is an explanatory view showing a method of applying an exposure adhesive, following FIG.

FIG. 4 is an explanatory view of a method of adhering a base film to the surface of exposure glass, which is subsequent to FIG. 3;

FIG. 5 is an explanatory view showing a method of applying a moisture-proof layer, following FIG.

FIG. 6 is an explanatory view showing a method of applying a photosensitive material, following FIG.

FIG. 7 is an explanatory view showing a method of cutting out the end portion of the hologram, following FIG. 6;

FIG. 8 is an explanatory view showing a method for applying a moisture-proof layer, following FIG.

FIG. 9 is an explanatory view showing a method for applying an adhesive layer, following FIG.

10 is an explanatory view showing a method of adhering the first glass to the surface of the hologram, following FIG.

FIG. 11 is an explanatory view showing a method of peeling off the base film, following FIG.

FIG. 12 is an explanatory view showing a method of cutting out the end portion of the moisture-proof layer, following FIG. 11.

FIG. 13 is an explanatory view showing a method of enclosing a hologram between two glasses, following FIG. 12;

FIG. 14 is an explanatory diagram of a hologram enclosing glass of Example 2.

FIG. 15 is an explanatory diagram of a base film having a moisture-proof film adhered thereto in the method for manufacturing a hologram-encapsulating glass of Example 2.

16 is an explanatory view of the exposure glass following FIG.

FIG. 17 is an explanatory view showing a method for applying an exposure adhesive, following FIG. 16;

FIG. 18 is an explanatory view of a method of adhering a base film to the surface of the exposure glass shown in FIG.

FIG. 19 is an explanatory view showing a method of applying a photosensitive material, following FIG.

FIG. 20 is an explanatory diagram showing a method of cutting out the end portion of the hologram, following FIG. 19;

FIG. 21 is an explanatory view showing a method for applying a moisture-proof layer, following FIG. 20.

FIG. 22 is an explanatory view showing a method of applying an adhesive layer, following FIG. 21.

FIG. 23 is an explanatory view showing a method of adhering the first glass to the surface of the hologram, following FIG. 22.

FIG. 24 is an explanatory view showing a method for peeling off the base film, following FIG. 23;

FIG. 25 is an explanatory view showing a method of enclosing a hologram between two glasses, following FIG. 24.

FIG. 26 is an explanatory diagram of a hologram enclosing glass of Example 3.

FIG. 27 is an explanatory diagram of a hologram-sealed glass of Example 4.

28 is an illustration of optical rotation of the moisture-proof layer in Example 5. FIG.

FIG. 29 is a diagram showing the relationship between the optical rotation of the moisture-proof layer and the visibility of the hologram-encapsulating glass in Example 5.

[Explanation of symbols]

 1,11. ． ． Moisture barrier, 10. ． ． Moisture-proof film, 2. ． ． Hologram, 20. ． ． Photosensitive film, 3. ． ． Adhesive layer, 5. ． ． Optical adhesive, 61. ． ． First glass, 62. ． ． Second glass, 7. ． ． Hologram-filled glass, 8. ． ． Middle layer, 9. ． ． Exposure glass, 91. ． ． Exposure adhesive, 92. ． ． Base film, A. ． ． Linearly polarized reference light, B. ． ． Linear polarization of object light, θ. ． ． Optical rotation of the moisture barrier,

Claims (12)

[Claims] 1. A hologram-encapsulating glass in which a hologram is encapsulated between a first glass and a second glass, and the entire surface of the hologram is covered with a moisture-proof layer for preventing infiltration of moisture. Hologram-encapsulating glass characterized in that. 2. The hologram enclosing glass according to claim 1, wherein the moisture-proof layer has no optical rotatory property. 3. The hologram enclosing glass according to claim 1, wherein the moisture-proof layer is a coating film formed by coating a moisture-proofing agent. 4. The hologram enclosing glass according to claim 1, wherein the moisture-proof layer has one side of the hologram which is the coating film and the other side of the hologram which is a moisture-proof film. 5. The polyvinyl chloride-based synthetic resin, the rubber-based resin, the polyolefin-based synthetic resin, the acrylic-based synthetic resin, the epoxy-based synthetic resin, and the fluorine-based resin according to claim 1, 2, or 3. 1. A hologram-encapsulating glass, characterized in that it is one or more selected from the group. 6. The hologram enclosing glass according to claim 1, wherein the moisture-proof layer has adhesiveness. 7. The hologram enclosing glass according to claim 1, wherein the moisture-proof layer is an ultraviolet-curable synthetic resin. 8. The hologram enclosing glass according to claim 1, wherein encapsulation of the hologram is performed using an optical adhesive such as polyvinyl butyral resin. 9. The hologram encapsulating glass according to claim 1, wherein an intermediate layer for increasing adhesive strength is provided between the moisture-proof layer and the optical adhesive. 10. The hologram enclosing glass according to claim 1, wherein the intermediate layer is a coating film made of a room temperature glass or a hydrophilic resin. 11. The hologram enclosing glass according to claim 1, wherein the moisture-proof layer has an optical rotation of 37 ° or less. 12. The hologram enclosing glass according to claim 1, wherein the moisture-proof layer has an optical rotation of 26 ° or less.