JP2003255870A - Display member with light accumulating function and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display member showing a light accumulating function with extremely high afterglow luminance at a low cost. <P>SOLUTION: In the display member, an image part 1 is formed on the back face of a light transmitting member 11, while a transparent adhesive layer 12 is applied on the back face corresponding to a white character part 2 or a transparent part 3. A layer of particles 13 of a large-size light accumulating material is density deposited in one layer on the transparent adhesive layer 12, that is, part of the particles adheres to the transparent adhesive layer 12 while the other part of the particles is exposed. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display member having a light storing function in which afterglow continues for a long time and a manufacturing method thereof.

[0002]

As a conventional display member having a light storing function,
What is made to adhere by printing glue on one surface of a plastic plate and applying (falling down) the phosphorescent material powder (for example, refer to Patent Document 1), and a luminous design means is provided in a part of the mug. A mixture of phosphorescent material particles having a particle size of 15 μm or more and 2 mm or less in the design means (for example, Patent Document 2
(See, for example, Patent Document 3) in which an emulsion layer having 0.5 to 3 mm of phosphorescent material particles dispersed in a resin is provided on one surface of a base material sheet, and a colored layer is provided on one surface of a translucent member. , A phosphorescent layer provided on the back surface thereof, or a reflective layer provided on the back surface thereof, and information is printed with the phosphorescent material (see, for example, Patent Document 4), the phosphorescent material composed of fine particles between the phosphorescent materials composed of coarse particles. In which the content ratio of the phosphorescent material is increased (for example, refer to Patent Document 5), a transparent bead layer is provided on the display (for example, refer to Patent Document 6), and the back surface of the phosphorescent material is filled with a transparent resin. Moreover, a dial of a timepiece that is held (for example, see Patent Document 7) is known. In addition, SrAl
It has been reported that for ₂ O ₄ : Eu ²⁺ , Dy ³⁺ phosphorescent materials, the larger the particle size, the greater the initial intensity of afterglow. That is, it has been clarified that the initial intensity of the afterglow depends not on the thickness of the phosphorescent material coating film or the thickness of the phosphorescent material sheet but on the particle diameter of the phosphorescent material. In addition, since the initial intensity is high, the duration of afterglow also becomes long. (For example, Non-Patent Document 1
reference).

[0003]

[Patent Document 1] Japanese Patent Laid-Open No. 10-31440 (

~

(FIGS. 12 and 13)

[Patent Document 2] Japanese Patent Application Laid-Open No. 2000-80361 (Claim 2, page 2)

[Patent Document 3] Japanese Patent Laid-Open No. 2000-290643 (

Paragraph)

[Patent Document 4] Japanese Patent Laid-Open No. 2001-166716 (Fig. 11, page 5 of the publication)

[Patent Document 5] Japanese Unexamined Patent Publication No. 10-884048 (

Paragraph)

[Patent Document 6] JP-A-11-109864 (

Paragraph)

[Patent Document 7] JP-A-9-15347 (

~

Paragraph)

[Non-patent document 1] Materials and materials Vol 114 p965-969 (199
8)

[0004]

In the prior art, the particles of the phosphorescent material are made as fine as possible and mixed with a resin to form a paint.
Alternatively, it is formed into a sheet. For example, in Patent Document 1, the powdery light-storing material is dropped onto the glue (adhesive layer), so that the light-storing material powder penetrates into the glue due to the large specific gravity of the light-storing material powder. That is, the phosphorescent material powder is dispersed in the paste. As shown in Non-Patent Document 1, when the particle diameter of the phosphorescent material is small, the initial intensity of afterglow becomes small and the afterglow time becomes short. Sufficient afterglow brightness cannot be obtained with the powdery phosphorescent material as in Patent Document 1, and the afterglow brightness is further reduced when the phosphorescent material powder is dispersed in the paste.

On the other hand, a large particle size phosphorescent material is disclosed in the above-mentioned Patent Documents 1 and 2. However, in these prior arts, for example, after sticking to the lamp cover of a 20 W fluorescent lamp, the afterglow brightness for 1 hour after leaving in the dark is 17 mcd / mm ² No light brightness is obtained. The reason why the sufficient afterglow brightness cannot be obtained in these prior arts is considered to be because the phosphorescent material is dispersed in an acrylic resin emulsion or the like.

Further, as in Patent Documents 4 to 7, a phosphorescent material is formed into a sheet shape, the phosphorescent material sheet and a sheet on which an image or a character is formed are overlapped, and light is accumulated from a transparent portion of the sheet on which the image or the character is formed. In the case of a type of display member that visually recognizes the material sheet, the phosphorescent material sheet in the portion overlapping the image or characters does not function as a phosphorescent material, which is wasteful, and a large amount of wasted phosphorescent material is used to illuminate the necessary parts. Therefore, it cannot be implemented at a cost.

[0007]

As long as a phosphorescent material layer having the same thickness is provided, a fine (powdered) phosphorescent material kneaded in a paint or large particles as disclosed in the prior art. Even if the diameter of the phosphorescent material particles are dispersed in the resin, it is the most afterglow brightness that the phosphorescent material layer itself is composed of the phosphorescent material particles having the same particle diameter as the thickness of the target phosphorescent material layer. The present invention has been made paying attention to the advantage.

That is, in the display member according to the present invention, a transparent adhesive layer is provided on a part of the back surface of the translucent member, and the transparent adhesive layer has one of the phosphorescent material particles having a diameter larger than the thickness of the transparent adhesive layer. This is a structure in which the phosphorescent material particles are arranged in a single layer by adhering one part and exposing the other part from the adhesive layer. By arranging only the phosphorescent material particles in a single layer in a space within a predetermined thickness range, a display member having the highest afterglow brightness can be obtained.

It is preferable in terms of cost that the portion of the back surface of the light-transmissive member to which the light-storing material is attached should not overlap the image or characters as much as possible. Further, even if it is a single layer, it is necessary that the phosphorescent material particles are closely attached, and the diameter of the phosphorescent material particle is D50 = 100 μm or more, D50
= 300 μm or more, preferably 500 μm or more, more preferably 1000 μm or more. Here, D50 refers to the maximum particle diameter when accumulated from small particles to 50% by weight in the particle size distribution of the phosphorescent material.

Further, in the case where the luminous material is automatically printed by mechanization, for example, when only the adhesive is applied with a silk screen or a roller and the particles of the luminous material are dropped on the adhesive, the luminous material is applied. If the material particles are too large, they may not stick to the adhesive.
Most preferably, 50 = 100 to 300 μm.

In another display member according to the present invention, a light-storing print layer is provided between light-transmitting members composed of a plurality of light-transmitting sheets, and the light-transmitting property is overlapped with the light-storing print layer in the thickness direction. A transparent adhesive layer is provided on the back surface of the member, and a portion of the phosphorescent material particles having a diameter larger than the thickness of the transparent adhesive layer adheres to this transparent adhesive layer, and the other portion is exposed from the adhesive layer, whereby the phosphorescent material particles are The structure is arranged in a single layer. As described above, by providing the printing layer containing the fine light-storing material, the light emitting surface can be made smooth and beautiful in appearance. Although the fine phosphorescent material has a low afterglow brightness, the afterglow brightness can be increased by disposing a large particle size phosphorescent material that functions as a backlight on the back side thereof. The particle diameter of the phosphorescent material contained in the phosphorescent printing layer is D50 of 300 μm or less,
It is preferably 150 μm to 15 μm.

In another display member according to the present invention, a phosphorescent printing layer is provided on a part of the back surface of the translucent member, and a transparent adhesive layer is provided on the back surface of the phosphorescent printing layer. A part of the phosphorescent material particles having a diameter larger than the thickness of the transparent adhesive layer adheres to the other and the other part is exposed from the adhesive layer, so that the phosphorescent material particles are arranged in a single layer.

Further, in order to increase the afterglow brightness of the phosphorescent material, it is effective to provide a reflection sheet on the back side of the large particle size phosphorescent material and utilize all the light emitted from the phosphorescent material. It is also effective to hold the phosphorescent material with a thin transparent resin layer from the back side of the large-particle-size phosphorescent material that has adhered. By doing so, it is possible to prevent the phosphorescent material from peeling off, and also to prevent the functional deterioration of the phosphorescent material due to moisture. Further, by filling the gap between the phosphorescent materials with a transparent resin having a high refractive index, it is possible to reduce the reflection of sunlight or the like on the surface of the phosphorescent material and increase the afterglow brightness.

Further, the display member according to the present invention includes a display member in which a plurality of single-layered large particle size phosphorescent materials are laminated. By stacking the layers, afterglow brightness is increased and uniform light emission is achieved. Further, if only the large particle size phosphorescent material is adhered, a gap is created between the particles of the large particle size phosphorescent material. The afterglow intensity can be increased by filling this gap with a light-storing material having a medium particle size or a small particle size. For example, the particle size of the medium particle size phosphorescent material is D50 = 3
0 to 100 μm, and the particle size of the small particle size phosphorescent material is D
50 = 100 μm or less. Further, as the display member, a retroreflective sheet such as a vinyl chloride sheet or glass beads having a self-reflection function may be partially attached.

On the other hand, in the method for manufacturing a display member having a light-storing function according to the present invention, a transparent adhesive layer is formed on the back surface side of the transparent member, and the diameter of the transparent adhesive layer is larger than the thickness of the transparent adhesive layer. The phosphorescent material was dropped or pressed so that only a part of the phosphorescent material was attached to the transparent adhesive layer and the other part was exposed from the adhesive layer and arranged in a single layer.

Another method of manufacturing a display member having a light-storing function according to the present invention is to superimpose a sheet having an ultraviolet-curing resin film on a translucent member displaying an image or characters, and to superimpose the image or the image on the sheet. Overlay the exposure film on which the reverse image of the characters was formed, and use the exposure film on which the reverse image was formed as a mask to expose the UV-curable resin film to cure the areas that were exposed to light and cure the areas that were not exposed to light. Leave as a transparent uncured resin film, then peel the exposure film on which the reverse image is formed to expose the uncured resin film,
A phosphorescent material particle having a diameter larger than the thickness of the uncured resin film is dropped on or pressed against the exposed uncured resin film to adhere a part of the phosphorescent material particle to the uncured resin film and expose the other part from the adhesive layer. At least, the phosphor particles were arranged in a single layer.

In the conventional printing method, the phosphorescent material having a large particle size could not be adhered only to a necessary portion, but as described above, the adhesive layer (uncured resin film) thinner than the particle size of the phosphorescent material. It became possible by putting down or pressing the phosphorescent material on.

When a transparent resin layer is provided on the back side of the adhered large particle size phosphorescent material for the purpose of waterproofing or the like, the transparent resin may be sprayed from the back side. Further, when manufacturing the display member in which the medium-sized or small-sized phosphorescent material is filled between the particles of the large-sized phosphorescent material, the large-sized phosphorescent material is first adhered in a layer, and then The particle size phosphorescent material or the small particle size phosphorescent material must be lowered or pressed. Even when the glass beads are attached to a part, the glass beads may be lowered or pressed in the same manner as the phosphorescent material.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a plan view of a display member according to the present invention, and FIG. 2 is a sectional view of the display member. The display member is composed of an image portion 1, a blank character portion 2 and a transparent portion 3 in the plan view. The image portion 1 also includes figures and characters. Incidentally, in the illustrated example, the example in which the image and the character are provided is shown, but the invention in which the image and the character are not provided is also included in the present invention.

The display member will be described with reference to the sectional views.
As the display member, the image portion 1 is formed on the back surface of the translucent member 11 made of a glass plate, a plastic plate, a plastic sheet, etc., and the transparent adhesive layer 12 is provided on the back surface corresponding to the blank character portion 2 or the transparent portion 3. The phosphorescent material particles 13 having a particle diameter larger than the thickness of the transparent adhesive layer 12 are densely attached to the transparent adhesive layer 12 in a single layer. In this embodiment, the phosphorescent material particles 13 having a large particle diameter of 1000 μm or more are selected. The phosphorescent material particles 13 may be covered with a thin transparent resin layer from the back side.

A reflective layer 1 is provided on the back side of the image area 1.
5 is formed. The reflective layer 15 forms a TiO ₂ layer by screen printing, for example. Then, the reflection sheet 16 is attached to the back side of the phosphorescent material particles 13 and the reflection layer 15. As the reflection sheet 16, for example, aluminum foil,
A TiO ₂ coated sheet or the like is used. Then, a waterproof base sheet 17 is attached to the back side of the reflection sheet 16. The reflective layer 15, the reflective sheet 16, and the waterproof base sheet 17 may be omitted.

Next, a method of manufacturing the display member will be described with reference to FIG. First, as shown in FIG. 3A, a sheet 20 having an ultraviolet curable resin film is laid on the translucent member (sheet) 11. The image portion 1 is formed on the translucent member 11, and the reflective layer 15 such as a TiO ₂ layer is formed on the image portion 1 by a method such as screen printing. The sheet 20 has a three-layer structure including an adhesive layer 20a, an ultraviolet curable resin film 20b, and a protective film 20c.

Next, as shown in FIG. 3B, the exposure film 21 on which the reverse image of the image area 1 is formed is attached to the sheet 2.
Stack on 0. When overlapping, the image portion 1 and the reverse image are overlapped so that they match each other. Then, the ultraviolet curable resin film is exposed by using the exposure film 21 on which the reverse image is formed as a mask to cure the part exposed to the light, and the part not exposed to the light is left as a transparent uncured resin film.

Then, as shown in FIG. 3C, the exposure film 21 and the protective film 20c are peeled off. As a result, the uncured resin film is exposed. This uncured resin film functions as an adhesive.

Then, the light-storing material 13 having a large particle diameter is dropped onto the resin layer. Then, the cured portion does not have an adhesive function, and only the uncured resin film functions as an adhesive. Therefore, as shown in FIG. Only the other parts are attached, and the other parts are exposed to form a single layer. Note that the luminescent material 13 can be attached in a layered manner by pressing the uncured resin film against the luminescent material 13 laid on a tray or the like instead of going down.

Thereafter, as shown in FIG. 3 (e), a transparent resin is sprayed on the back surface of the large-diameter light-storing material 13 adhered in a single layer if necessary, and further shown in FIG. 3 (f). like,
The reflection sheet 16 is attached to the back side. Then, by attaching the waterproof base sheet 17 such as a foamed resin sheet,
The display member shown in FIG. 2 is completed.

In the illustrated example, the adhesive layer is formed on the white character portion 2 or the transparent portion 3 other than the image portion 1 by exposure, but the adhesive layer is formed in a predetermined area by stamping, screen printing or brush coating. You may form.

FIG. 4 is a cross-sectional view of a display member according to another embodiment. In this embodiment, an image portion 1 is formed on the back surface side of the sheet-like translucent member 11, and the image portion other than this image portion 1 is formed. The transparent portion 3 is provided with a light-storing printed layer 30 containing a light-storing material having a fine particle size, and the transparent adhesive layer 12 is provided on the back side of the light-storing printed layer 30.
The large particle size phosphorescent material 13 adheres in a layered manner via the, and the large particle size phosphorescent material 13 further adheres to the back side of the monolayered large particle size phosphorescent material 13 via the transparent adhesive to form a total layer. It is attached in two layers. Since the large particle size phosphorescent material 13 acts as a backlight, three or more layers may be laminated.

FIG. 5 is a cross-sectional view of a display member according to another embodiment. In this embodiment, the translucent member 11 is composed of two translucent sheets 11a and 11b. A light-storing printing layer 30 in which the image portion 1 is provided between the sheets 11a and 11b and the transparent portion 3 contains a light-storing material having a fine particle diameter.
Further, a retroreflective sheet 31 such as a vinyl chloride sheet is also fixed between the translucent sheets 11a and 11b. Then, the large particle size phosphorescent material 13 is laminated in a two-layered manner by the above-described method on the back surface side of the translucent sheet 11a at the portion overlapping the phosphorescent printing layer 30 in the thickness direction. Also in this embodiment, since the large particle size phosphorescent material 13 acts as a backlight, the afterglow brightness can be increased and the roughness of the particles is not noticeable in the light emitting portion. Furthermore, the durability of the retroreflective sheet 31 is also improved.

FIG. 6 is a cross-sectional view of a display member according to another embodiment. In this embodiment, a plurality of large particle size phosphorescent materials 13 are laminated, and a large particle size phosphorescent material 13 is provided between them. The particle size or small particle size phosphorescent material 13a is filled. The filling method is such that the large particle size phosphorescent material 13 is first dropped onto the transparent adhesive layer to be adhered thereto, and then the medium particle size or small particle size phosphorescent material 13a is dropped. If reversed, the large particle size phosphorescent material 13 cannot be attached.

FIG. 7 is a plan view of a display member according to another embodiment.
FIG. 8 is a cross-sectional view of the display member shown in FIG. 7. In this embodiment, part of the transparent portion 3 is made to emit light by the phosphorescent material 13, and the other part is made of glass having a self-reflection function. The beads 23 have a reflection function. The method of holding the glass beads 23 is as in the case of the light-storing material 13, by dropping onto the adhesive layer or pressing the glass beads 23 against the adhesive layer.
Although a plurality of embodiments are shown and described, the present invention also includes a combination of these embodiments.

[0032]

The following (Table) shows the results of experiments on the particle size of the phosphorescent material and the afterglow brightness of 10 minutes and 60 minutes after leaving it in the dark. From this (table), the particles of the phosphorescent material are shown. Increasing the diameter,
It can be seen that the afterglow luminance is increased by stacking a plurality of layers.

[0033]

[Table 1]

As is clear from the above (Table), according to the present invention, if the afterglow luminances of 10 minutes and 60 minutes after being left in the dark were 5 mcd / mm ² and 0.9 m, respectively, in the conventional case.
The value of cd / mm ² is 1 by using a phosphorescent material with a particle size of 150 μm and densely arranging it in a single layer.
It becomes 20 mcd / mm ² and 25 mcd / mm ² , and it is possible to obtain a display member having 20 times or more the afterglow brightness as compared with the conventional case. Therefore, an extremely wide range of applications such as traffic signs, warning boards, and guide boards can be considered. Moreover, since the amount of the phosphorescent material to be used may be used only in a portion where light emission is desired, it is advantageous in cost.

[Brief description of drawings]

FIG. 1 is a plan view of a display member according to the present invention.

FIG. 2 is a sectional view of the display member.

3 (a) to 3 (f) are views for explaining the manufacturing procedure of the display member according to the present invention.

FIG. 4 is a sectional view of a display member according to another embodiment.

FIG. 5 is a sectional view of a display member according to another embodiment.

FIG. 6 is a sectional view of another embodiment.

FIG. 7 is a plan view of a display member according to another embodiment.

8 is a sectional view of the display member shown in FIG.

[Explanation of symbols]

1 ... Image part, 2 ... White character part 2, 3 ... Transparent part, 11 ...
Translucent member, 12 ... Transparent adhesive layer, 13 ... Large particle size phosphorescent material particle, 13a ... Medium particle size or small particle size phosphorescent material particle, 15 ... Reflective layer, 16 ... Retroreflective sheet, 17 ... Waterproof base sheet , 20 ... Sheet provided with UV curable resin film, 21 ... Exposure film with reverse image formed, 22 ... Transparent resin, 2
3 ... Glass beads having a self-reflection function, 30 ... Luminescent material printing layer, 31 ... Retroreflective sheet.

Claims (15)

[Claims] 1. A transparent adhesive layer is provided on a part of the back surface of the translucent member, and a part of the phosphorescent material particles having a diameter larger than the thickness of the transparent adhesive layer adheres to the transparent adhesive layer while the other part does not. A display member having a light-storing function, wherein the phosphorescent material particles are arranged in a single layer by being exposed from the adhesive layer. 2. A phosphorescent printing layer is provided between translucent members made of a plurality of translucent sheets, and a transparent adhesive layer is provided on the back surface of the translucent member overlapping the phosphorescent printing layer in the thickness direction. , A part of the phosphorescent material particles having a diameter larger than the thickness of the transparent adhesive layer adheres to the transparent adhesive layer, and the other part is exposed from the adhesive layer, whereby the phosphorescent material particles are arranged in a single layer. And a display member having a luminous function. 3. A phosphorescent printing layer is provided on a part of the back surface of the translucent member, a transparent adhesive layer is provided on the back surface of the phosphorescent printing layer, and the transparent adhesive layer has a diameter larger than the thickness of the transparent adhesive layer. Part of the phosphorescent material particles adheres and the other part is exposed from the adhesive layer, whereby the phosphorescent material particles are arranged in a single layer, and a display member having a phosphorescent function. 4. The display member having a luminous function according to claim 1, wherein a reflective sheet or a white sheet is provided on the back side of the one-layer luminous material. A display member having. 5. The display member having a light-storing function according to claim 1, wherein a portion of the one-layer light-storing material exposed from the adhesive layer is held by a transparent resin from the back side. A display member having a luminous function. 6. The display member having a light-storing function according to claim 1, wherein another light-storing material is attached in a single layer to the back side of the one-layer light-storing material via a transparent adhesive. A display member having a light-storing function. 7. The display member having a light-storing function according to claim 1, wherein a light-storing material having a diameter smaller than this is held or adhered between particles of the one-layer light-storing material. And a display member having a luminous function. 8. The display member having a light-storing function according to any one of claims 1 to 7, wherein the particle diameter of the light-storing material in the one-layer form has D50 of 150 μm or more. Element. 9. The display member having a light-storing function according to claim 1, wherein a retroreflective sheet or glass beads having a self-reflection function is attached to a part of the transparent adhesive layer. And a display member having a luminous function. 10. A transparent adhesive layer is formed on the back surface side of the translucent member, and a phosphorescent material having a diameter larger than the thickness of the transparent adhesive layer is dropped onto or pressed against the transparent adhesive layer to form the phosphorescent material on the transparent adhesive layer. A method of manufacturing a display member having a light-storing function, characterized in that only one part is attached and the other part is exposed from the adhesive layer and arranged in a single layer. 11. A translucent member displaying an image or characters is overlaid with a sheet provided with an ultraviolet curable resin film, an exposure film having an inverse image of the image or characters formed thereon is overlaid on the sheet, and the inverse image is displayed. The UV-curable resin film is exposed using the formed exposure film as a mask to cure the part exposed to the light, leaving the part not exposed to the light as a transparent uncured resin film, and then exposing the reverse image. The film for peeling is exposed to expose the uncured resin film, and the phosphorescent material particles having a diameter larger than the thickness of the uncured resin film are dropped onto or pressed against the exposed uncured resin film, and the phosphorescent material particles are applied to the uncured resin film. A method for manufacturing a display member having a phosphorescent function, characterized in that a part of the phosphorescent material is attached and the other part is exposed from the adhesive layer, and the phosphorescent material particles are arranged in a single layer. 12. The method for manufacturing a display member having a light-storing function according to claim 10 or 11, wherein light-storing material particles are adhered in a layer on the transparent adhesive layer or the uncured resin film, A method for manufacturing a display member having a light-storing function, characterized in that a transparent resin is sprayed from the back side of the light-storing material particles to retain the light-storing material particles. 13. The method for manufacturing a display member having a light-storing function according to claim 10 or 11, wherein the light-storing material particles are dropped onto or pressed against the transparent adhesive layer or the uncured resin film. After the other part is exposed from the adhesive layer or the uncured resin film to adhere the phosphorescent material particles in one layer, the transparent adhesive layer is dipped or brushed on the back side of this one-layered phosphorescent material. Provided by means,
A method for producing a display member having a light-storing function, characterized in that the light-storing material is again dropped or pressed against the transparent adhesive layer to adhere the large-particle-size light-storing material in a single layer. 14. The method for manufacturing a display member having a phosphorescent function according to claim 10 or 11, wherein a phosphorescent material is dropped onto or pressed against the transparent adhesive layer or the uncured resin film to form a part of the phosphorescent material particles. After the other part is exposed from the adhesive layer or the uncured resin film and the phosphorescent material particles are adhered in a single layer, the phosphorescent material particles having a diameter smaller than the phosphorescent material particles are lowered or pressed to form a single layer phosphorescent light. A method of manufacturing a display member having a light-storing function, characterized in that a light-storing material having a diameter smaller than this is held or adhered between particles of the material. 15. The method of manufacturing a display member having a light-storing function according to claim 10, wherein the light-storing material is adhered in a single layer, and then a reflective layer is provided on the back side thereof. A method for manufacturing a display member having a luminous function.