JPH09230120A - Luminous sheet material and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a luminous sheet material having a wide latitude for the shape and size of a reflection area and a light-accumulating and emitting area, and high performance for light-accumulating and emitting property. SOLUTION: A reflection layer 14 is formed on a base sheet 12 by vapor deposition of aluminum, on which a glass beads layer 18 comprising lots of glass beads 16 is formed. Then lots of light-accumulating and emitting agent layers 20 are formed on the glass beads layer 18 and these layers 20 are covered with a cover sheet 22. Since nothing prevents propagation of the light passing through the cover sheet 22 to enter the light-accumulating and emitting layers 20, sufficient light beams are supplied to the light-accumulating and emitting layers 20 to cause sufficient accumulation and emission of light. The light- accumulating and emitting layers 20 are formed, for example, by printing, the latitude for the shape, size or distribution pattern is extremely wide.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a luminescent sheet material having a high-luminance reflecting ability and a luminous luminous ability and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, as illustrated in FIG. 4, a base sheet 100, a reflective layer 102 formed by vapor-depositing aluminum or the like on one surface thereof, and a transparent sphere 104 such as glass beads on the reflective layer 102. Transparent sphere layer 10 formed by adhesion
6. There is a high-brightness reflection sheet 112 including a transparent cover sheet 110 connected to the transparent sphere layer 106 via the anchor material 108. In such a high-brightness reflection sheet 112, an air layer 114 is provided between the transparent sphere 104 and the cover sheet 110 in order to make the refractive index at the interface of the transparent sphere 104 appropriate. It functions to form the air layer 114.

Since such a high-brightness reflective sheet has excellent retroreflective performance, it is used, for example, for road signs illuminated by the headlights of automobiles. For example, in the case of a road sign, reflection is sufficient for a driver of a vehicle equipped with a headlight, but display for reflection is insufficient for a pedestrian.

In view of this, Japanese Laid-Open Patent Publication No. 5-173008 discloses that, in addition to an automobile equipped with a light source, a pedestrian or the like does not have a light source, and a sufficient display capability is exhibited. A luminescent sheet-like material has been proposed which combines reflection and luminous emission.

[0005]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
According to the technique disclosed in Japanese Patent Laid-Open No. 008, high-luminance reflection and phosphorescent light emission are compatible at the same time. However, in order to push the transparent sphere away by heat embossing to form a phosphorescent light emitting region, the width of the light storing light emitting region is increased. Since it is difficult to widen the area, the degree of freedom in the shape and size of the reflection area and the luminous area is extremely low.

Further, even if the transparent sphere is pushed away by the heat embossing, it does not mean that the transparent sphere does not exist at all in the luminous light emitting region. For this reason, the remaining reflective layer of the transparent spheres obstructs the path of the light toward the light-storing luminescent agent, which may result in insufficient light-storing.

Further, when the amount of the luminous pigment is increased in order to increase the intensity of luminous emission, the adhesive force between the transparent cover sheet and the transparent cover sheet decreases if the luminous luminous agent layer is directly used as an adhesive layer. It is essential to interpose a transparent adhesive between them. It is an object of the present invention to provide a luminescent sheet-like material which has a very high degree of freedom in the shape and size of the reflection area and the light-emission area and has a high light-emission performance.

[0008]

As a means for solving the above-mentioned problems, the luminous sheet material according to claim 1 is fixed to substantially one layer along one surface of the base material sheet to form a transparent spherical layer. A plurality of transparent spheres, a reflective layer formed on the base sheet side of the transparent spheres, and a phosphorescent agent layer that covers a plurality of compartments on the surface of the transparent sphere layer opposite to the base sheet. And a translucent cover sheet adhered to the phosphorescent agent layer via a transparent adhesive.

According to a second aspect of the present invention, there is provided the luminous sheet material according to the first aspect, in which the peripheral portion is sealed in an arbitrary shape, size and pattern. The method for producing a luminescent sheet material according to claim 3, wherein a plurality of transparent spheres are adhered to a reflective layer formed on one surface of the base material sheet to form a transparent sphere layer, and the transparent sphere is used as the base material. Forming a luminous luminous agent layer by adhering a luminous luminous agent to a plurality of compartments on the side opposite to the sheet, and adhering a translucent cover sheet to the luminous luminous agent layer via a transparent adhesive. Is characterized by.

The method for producing a luminescent sheet material according to claim 4 is the method for producing a luminescent sheet material according to claim 3,
The transparent sphere layer is not provided on the edge of the base sheet, and the peripheral edge is sealed by adhering the cover sheet to the edge of the base sheet via a transparent adhesive. .

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION In the luminous sheet material according to claim 1, which has the above-mentioned structure, a plurality of transparent spheres are fixed to substantially one layer along one surface of the base sheet to form a transparent sphere layer. Then, a reflective layer is formed on the base sheet side of these transparent spheres.

The photoluminescent agent layer covers a plurality of compartments on the surface of the transparent sphere layer opposite to the base sheet, and the translucent cover sheet adheres to the photoluminescent agent layer via a transparent adhesive. To be done. Although the phosphorescent agent layer and the cover sheet are in contact with each other,
A space, that is, an air layer, is formed between the cover sheet and the transparent sphere layer that is not covered with the photoluminescent agent layer.

Part of the light that has passed through the cover sheet reaches the photoluminescent agent layer as it is. Since there is no part other than the cover sheet in the path of this light, sufficient light is supplied to the photoluminescent agent layer, and sufficient photoluminescence is performed. On the other hand, the light avoiding the photoluminescent agent layer reaches the transparent sphere through the air layer and is retroreflected by the transparent sphere. At this time, the presence of the air layer makes the refractive index at the interface between the transparent sphere and the air layer appropriate.

Since the photoluminescent agent layer is formed on the transparent spherical layer by, for example, printing, the shape and area of the photoluminescent agent layer, the reflection area and the photoluminescent area on the luminous sheet are practically defined. There is no limit to the ratio. Since the peripheral portion of the luminous sheet material according to claim 2 is sealed, it is possible to prevent water and water vapor from entering the inside. For this reason, peeling of each layer and reduction in brightness due to moisture do not occur.

In the method for producing a luminescent sheet material according to a third aspect, first, a plurality of transparent spheres are first bonded to a reflective layer formed on one surface of the base sheet to form a transparent sphere layer. The material of the base sheet is not particularly limited, for example, polyester,
Plastics such as vinyl chloride, acrylic and polyurethane can be used. Since the luminescent sheet-like material is often used by sticking it to, for example, a steel plate or the like, it is preferable that the base sheet is thin, although it does not impair the flexibility as the luminescent sheet-like material and has a problem of strength. .

The reflective layer can be formed by vapor-depositing a metal such as aluminum on the base sheet, but a metal such as aluminum may be vapor-deposited on a transparent sphere such as a hemisphere to form the reflective layer. When a transparent sphere is adhered to the base sheet, an adhesive is applied on the reflective layer if the reflective layer is vapor-deposited on the base sheet, and an adhesive is applied to the base sheet when the reflective layer is vapor-deposited on the transparent sphere. Apply and bond. The thickness of the adhesive preferably does not exceed the radius of the transparent sphere.

Next, the luminous luminous agent is attached to a plurality of sections on the surface of the transparent sphere opposite to the base sheet to form a luminous luminous agent layer. Various methods such as printing and coating can be used to attach the photoluminescent agent. As the luminous agent, Al ₂ O ₃ ,
There are CaO, MgO, etc., and CP-0 from Chemtech Co., Ltd.
3, CP-04, CP-05, etc. are easily available. These CP-03, CP-04, and CP-05 are powders, and if a resin or the like is added to them, they can be made into paints or inks.

There is no particular limitation on the shape or number of the compartments to which the photoluminescent agent is attached. For example, by arranging this section (luminous light emitting section) in a square shape in a checkered pattern, the area ratio between the section (reflecting section) that is not the luminous light emitting section and the luminous light emitting section can be made approximately 1: 1. At this time, by appropriately selecting the dimensions of the light-emission section and the reflection section and arranging them in an evenly distributed manner, for example, in a checkered pattern, the entire surface can be reflected or the entire surface can be seen to emit light.

After forming the photoluminescent layer, a transparent adhesive is applied to the surface of the photoluminescent layer, for example, and a translucent cover sheet is bonded thereto. As a result, a luminescent sheet-like material whose both surfaces are covered with the base sheet and the cover sheet is completed. The cover sheet may be made of any material as long as it is translucent, and the material is not limited, but plastics such as polyester, vinyl chloride, acryl and polyurethane can be used similarly to the base sheet. Since the luminescent sheet-like material is often used by being attached to, for example, a steel plate or the like, the cover sheet is preferably thin although it does not impair the flexibility as the luminescent sheet-like material and has a problem of strength.

It is also possible to use a colored sheet as the cover sheet, and the light directed to the outside due to reflection and accumulated light emission can be used as colored light. Claim 4
As described, if the transparent sphere layer is not provided at the edge of the base sheet, and the peripheral edge is sealed by adhering the cover sheet to the edge of the base sheet via the transparent adhesive, The luminescent sheet material described in 2 can be obtained.

[0021]

Concrete Example Next, a concrete example as an example of the embodiment of the present invention will be described. First, the luminous sheet material 1 of this specific example
A schematic structure of 0 will be described with reference to FIG.

As shown in FIG. 1, the luminescent sheet material 10
In, the reflective layer 14 formed by vapor-depositing aluminum is provided on one surface of the base sheet 12 made of polyester. A large number of glass beads 16 are adhered to form a glass bead layer 18 on the reflective layer 14. In addition,
The glass bead layer 1 is provided on the edge portion 13 of the base sheet 12 (more precisely, the reflection layer 14 formed on the base sheet 12).
8 is not provided.

On the glass bead layer 18, a large number of photoluminescent agent layers 20 containing photoluminescent agents are provided. The planar shape of each photoluminescent agent layer 20 is substantially square as shown in FIG. 1 (b). The photoluminescent agent layer 20 is covered with a transparent cover sheet 22 made of polyester.

The cover sheet 22 is adhered to the luminescent agent layer 20 and the edge portion 13 with a transparent adhesive, and in a portion where the luminescent agent layer 20 does not exist, the cover sheet 22 and the glass bead layer 18 are separated from each other. An air layer 24 is formed at the bottom. It should be noted that the application of the adhesive 26 to the surface 20a of each phosphorescent agent layer 20 is in a cross shape as shown in FIG. 1 (b), and the entire surface 20a of the phosphorescent agent layer 20 is adhesive 26. Is not covered by.

The plane shape of the luminescent sheet material 10 is as follows.
For example, as shown in FIG. 2, it can be made into a substantially square shape, or as shown in FIG. As shown in FIGS. 2 and 3, the luminous sheet material 1
0 as a whole, the luminous phosphor layer 20 and the air layer 24 form a checkered pattern, and the luminous phosphor layer 20 and the air layer 24
And are almost evenly distributed.

When the luminous sheet material 10 is irradiated with light, the glass beads 1 are formed in the region corresponding to the air layer 24.
It is retroreflected by the reflectivity of 6 and is accumulated in the luminous phosphor layer 20 (accurately, the luminous phosphor is excited). Since there is no path other than the cover sheet 22 in the path of the light that passes through the cover sheet 22 and reaches the luminous luminous agent layer 20, sufficient light is supplied to the luminous luminous agent layer 20 and sufficient luminous emission is performed. .

As described above, the photoluminescent agent layer 20 and the air layer 2
Since 4 and 4 are in a checkered pattern, it seems that the entire surface is reflected when the light is irradiated and the reflection is dominant, and the entire surface is reflected when there is no light irradiation and the light emission from the luminous phosphor layer 20 is dominant. It seems to be emitting light.

Further, since the base sheet 12 and the cover sheet 22 are adhered to each other at the edge portion 13 to form a hermetically sealed state, it is possible to prevent water or water vapor from entering the inside of the luminescent sheet material 10. For this reason, peeling of each layer and reduction in brightness due to moisture do not occur. Such a luminous sheet material 1
0 was manufactured by the following procedure.

First, aluminum is vapor-deposited on one surface of the base sheet 12 to form the reflection layer 14. In addition, you may purchase and use such a vapor deposition sheet. Next, the reflective layer 14
An adhesive is applied on the glass beads 16 and the glass beads 16 are adhered to almost one layer to form a glass bead layer 18.

Next, a pattern is printed on the glass bead layer 18 with a high brightness phosphorescent ink (CP-03, Chemtech Co., Ltd.) to provide a phosphorescent agent layer 20. Further, a transparent adhesive 26 is printed on the photoluminescent layer 20 and the edge portion 13.
As shown in FIG. 1B, the transparent adhesive 26 is printed on the luminous phosphor layer 20 in a cross-shaped pattern. Then, the luminous phosphor layer 20
The cover sheet 22 is adhered to the top and the edge portion 13.

The luminescent sheet material 10 is completed by the above procedure. As is clear from this example, since the luminous phosphor layer 20 is printed, each luminous phosphor layer 2 is printed.
The shape and size of 0, the dispersion pattern of the photoluminescent agent layer 20, and the like are virtually unlimited. Further, since the transparent adhesive for the cover sheet 22 is also applied by printing, it is possible to appropriately deal with the shape, size, and dispersion pattern of the photoluminescent agent layer 20.

Although the embodiments of the present invention have been described with reference to the specific examples, the present invention is not limited to such specific examples, and various modifications can be made without departing from the gist of the present invention. Needless to say. For example, in the specific example, the planar shape of the photoluminescent agent layer 20 is a square, but can be various shapes such as a triangle, a circle, a quadrangle such as a rhombus, and an irregular shape. Of course, the shape and the dispersion pattern of the air layer 24 (that is, the reflection section) can be changed according to the planar shape and the dispersion pattern of the luminous phosphor layer 20.

In the specific example, the transparent adhesive is applied to the luminous luminous agent layer in a cross shape, but it is not always necessary to form the cross adhesive, and it may be applied in a continuous pattern or a linear shape on the pattern. Further, for example, if it is a completely transparent adhesive or an adhesive excellent in translucency, it may be applied to the entire surface of the photoluminescent agent layer.

[0034]

As described above, the luminous sheet material according to claim 1 has no obstacle to the path of light passing through the cover sheet and reaching the luminous agent layer, and thus the luminous agent. Sufficient light is supplied to the layer to provide sufficient accumulated light emission. Further, the shape and the dispersion pattern of the luminous layer are extremely flexible and practically unlimited.

In the luminescent sheet material according to the second aspect, peeling of each layer and reduction of brightness due to moisture invading the inside do not occur. The method for producing a luminescent sheet material according to claim 3 is suitable for producing the luminescent sheet material according to claim 1.

The method for producing a luminescent sheet material according to claim 4 is suitable for producing the luminescent sheet material according to claim 2.

[Brief description of drawings]

1A and 1B are explanatory views of the structure of a specific example of a luminescent sheet material, FIG. 1A is a schematic view of a cross-sectional structure of a luminescent sheet material, and FIG. It is explanatory drawing of the adhesive agent.

FIG. 2 is a view showing an example of a planar shape of a specific example of a luminous sheet material.

FIG. 3 is another exemplary view of the planar shape of the specific example of the luminescent sheet.

FIG. 4 is a schematic diagram of a cross-sectional structure of a conventional high-brightness reflection sheet.

[Explanation of symbols]

 10 ... Luminous sheet-like material, 12 ... Substrate sheet, 13 ... Edge, 14 ... Reflective layer, 16 ... Glass beads (transparent sphere), 18 ... Glass bead layer (Transparent sphere layer), 20 ... Luminescent agent layer, 20a ... Surface, 22 ... Cover sheet, 24 ... Air layer, 26 ... Adhesive.

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Shinichi Morimoto 14-2, Rinaka Sakahara, Wachi-cho, Funai-gun, Kyoto Prefecture

Claims (4)

[Claims] 1. A plurality of transparent spheres, which are fixed to substantially one layer along one surface of a base material sheet to form a transparent sphere layer, a reflective layer formed on the base material sheet side of the transparent spheres, and the transparent material. A luminescent layer covering a plurality of compartments on the surface of the spherical layer opposite to the base sheet, and a translucent cover sheet adhered to the luminescent layer via a transparent adhesive. Naruluminous sheet material. 2. The luminescent sheet material according to claim 1, wherein the peripheral portion is sealed in an arbitrary shape, size and pattern. 3. A plurality of transparent spheres are adhered to a reflective layer formed on one surface of a base sheet to form a transparent sphere layer, and a plurality of transparent spheres on the surface opposite to the base sheet. A luminous sheet is formed by adhering a luminous agent to the compartment of (1) to form a luminous agent layer, and a translucent cover sheet is adhered to the luminous agent layer via a transparent adhesive. Manufacturing method. 4. The method for producing a luminescent sheet material according to claim 3, wherein the transparent sphere layer is not provided at the edge of the base sheet, and the cover sheet is made transparent at the edge of the base sheet. A method for producing a luminescent sheet-like product, characterized in that the peripheral portion is sealed by adhering with an adhesive.