JP2685838B2 - Fluorescent display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention can easily form a display pattern,
The present invention relates to a fluorescent display having excellent interest.

[Conventional technology]

2. Description of the Related Art Conventionally, there is known a light-collecting display device in which a display pattern is formed on a fluorescent sheet by a convex portion, a groove, a file, a penetrating ink, or the like (Japanese Utility Model Publication No. 52-30859).

However, in this display device, it is necessary to provide a convex portion on the fluorescent sheet by embossing, engrave a groove, and to use a special ink having permeability to the resin of the fluorescent sheet, and further change the display pattern. There are drawbacks such as difficulty.

[Problems to be solved by the invention]

An object of the present invention is to provide a light-collecting fluorescent display that can easily form a display pattern, and further a fluorescent display that can be repeatedly used, which eliminates the difficulty of forming a display pattern in the above conventional display device. It is in.

[Means for solving the problem]

The above-mentioned object is that a display pattern is formed on a transparent fluorescent film or sheet by a light diffusive reflective material in close contact with the transparent fluorescent film or sheet, and the fluorescent reflectance of the light diffusive reflective material is 20% or more and the display pattern. Is achieved by a fluorescent display whose total area is less than 70% of the area of the fluorescent film or sheet. Further, the above object is achieved by a fluorescent display in which the light diffusive and reflective material can be removed without substantially damaging the fluorescent film or sheet.

The present invention provides a display pattern on a fluorescent sheet by forming a convex portion, engraving a groove, or immersing a special penetrating ink in a resin in the prior art, while a fluorescent pattern is formed. A display pattern is formed on a film or sheet with a light-diffusive reflective material.

In the present invention, the substance forming the display pattern may be one that adheres to the fluorescent film or sheet,
You can use familiar materials such as general paint, printing ink, and adhesive tape.

 The present invention will be described below with reference to FIG.

The surface of the fluorescent film or sheet 1 on the opposite side to which the light diffusive reflective material 2 is closely attached is the display surface, and the light diffusive reflective material 2 is arranged so as to have a desired display pattern when viewed from the display surface side.

With such a structure, the fluorescence generated by the light incident on the fluorescent film or sheet is radiated from the display pattern, so that the display pattern looks brighter than the other fluorescent film or sheet 1, so-called light-collecting property. Functions as a fluorescent display.

The light diffusive and reflective material 2 is preferably one that can be removed from a fluorescent film or sheet without substantially damaging them, in which case it can be repeatedly used for correcting errors or forming a completely new display pattern.

As the fluorescent film or sheet 1, a transparent resin mixed with a fluorescent colorant and formed by, for example, extrusion molding and having a normal thickness of 20 μm to 5 mm is used.

How the fluorescent display pattern looks depends on the thickness,
When it is thick, the entire display pattern looks bright, whereas
When the width is 2 mm or less, particularly intense fluorescence is radiated from the edge portion 1 to 3 mm of the display pattern, resulting in a edgy and attractive display.

In the present invention, a sheet having a thickness of 0.2 mm or more is distinguished from a sheet and a sheet having a thickness of less than 0.2 mm is distinguished from a film.

In the present invention, it is essential that the total area of the display pattern 2 is 70% or less of the area of the fluorescent film or sheet 1, and if it exceeds this, the light condensing effect cannot be exhibited, and particularly in an environment with a small amount of light, display is performed. The fluorescence of the pattern is weak, resulting in poor visibility.

The resin used for the fluorescent film or sheet needs to be a transparent resin, and it is particularly preferable that the total light transmittance is 85% or more when formed into a film or sheet without mixing a fluorescent colorant. If the transparency is poor, the absorption of excitation light and fluorescence in the resin becomes large, and the fluorescence emitted from the display pattern becomes weak.

Specific examples of the transparent synthetic resin include, for example, vinyl chloride resin, polystyrene resin, methacrylic resin, polycarbonate resin, and the like. Particularly, methacrylic resin has high transparency and excellent visibility.

As the fluorescent colorant, in accordance with the desired design, for example, rhodamine-based, eosin-based, flavin-based, osphine-based, benzopyran-based, thioindigo-based or heterocyclic alcohol-soluble dyes or oil-soluble dyes oleate or A phosphor such as stearate,
Fluorescent colors such as red, blue, green and orange are selected.

The mixing amount of the fluorescent colorant needs to be 0.01 to 5% by weight with respect to the resin forming the fluorescent film or sheet. When the content of the fluorescent colorant is less than 0.01% by weight with respect to the resin, the color tone of the fluorescent film or sheet becomes whitish, the amount of fluorescence emitted from the display pattern decreases, and the content of the fluorescent colorant is mixed. If it exceeds 5% by weight with respect to the resin, the difference in visibility between the display pattern portion and other portions is reduced, and it becomes difficult to recognize the display pattern particularly in an environment with a small amount of light, which is not preferable.

As the light diffusive reflective material 2 forming the display pattern,
For example, with a paint or printing ink or an adhesive that can adhere to a fluorescent film or sheet 1 containing a pigment, an adhesive,
Alternatively, an opaque film, an opaque resin plate, paper, a sheet made of an inorganic material or the like which can be attached by these, and whose fluorescence reflectance is 20% or more is used.

Here, the fluorescence reflectance refers to the reflectance of the fluorescent colorant used for the fluorescent film or sheet with respect to the fluorescence, and the reflectance is defined as follows. That is, the incident angle is 0
This is a percentage display with the reflection intensity of the light received by the perfect diffuse reflection surface being 100 when measured under the conditions of ゜ and light receiving angle of 45 ゜. Specifically, it was normalized at the wavelength interval of 5 nm. This is a value obtained by calculating the product of the fluorescence intensity of the fluorescent colorant and the spectral solid angle reflectance of the light diffusing reflector, and adding this over the fluorescence wavelength range.

If the fluorescence reflectance of the light diffuse reflector does not reach 20%,
The amount of fluorescent light emitted is reduced and a clear pattern cannot be displayed.

The display pattern may be formed in the same manner as when forming characters and patterns on a normal resin plate, and it is a film-like material with an adhesive or an adhesive, which is drawn by a paint, printed or cut into the shape of the display pattern. , It can be done by attaching a sheet. At this time, a transparent thin film may be formed on the fluorescent film or sheet 1 by a primer treatment or the like.

In the case of sticking, it is preferable to avoid a substance that lowers the reflectance of the light diffusive reflector, for example, a black adhesive or tacky agent.

A pattern such as a non-fluorescent or fluorescent character or pattern other than the display pattern of the present invention may be drawn or printed on the display of the present invention by a paint, a marking film or the like.

The display of the present invention is used by being attached to a transparent substrate, screwed to a wall, or attached to a wall or the like with a double-sided adhesive tape that also serves as a fluorescent display pattern. Further, as a place of use, the visibility is exhibited even in a room with a small amount of light, but an ultraviolet light source or the like may be used for irradiation with light.

In order to make it easy to correct the display pattern and to enable repeated use of the fluorescent sheet, use paint or printing ink that contains a vehicle that strongly adheres to the fluorescent film or sheet, or use a solvent that corrodes the fluorescent sheet. It is preferable to avoid the penetrating ink.

The method of removing the display pattern to correct or change the display pattern depends on the type of printing ink or paint, but it is possible to mechanically scrape it off with a cloth, etc. For example, a method of dissolving the vehicle of the printing ink with a solvent that dissolves it and removing it.

Also in the case of tacking with an adhesive, one having an unnecessarily strong adhesive force is not preferable, and one having no so-called adhesive residue is preferable.

〔Example〕

Examples 1 to 11 and Comparative Examples 1 to 4 Methacrylic resin obtained by copolymerizing 94 parts by weight of methyl methacrylate and 6 parts by weight of methyl acrylate (total light transmittance 9
3.5%) containing a fluorescent colorant in a master pellet (made by Bayer, fluorescent colorant concentration: 2.5% by weight) at a ratio such that the fluorescent colorant concentration becomes the concentration shown in Table 1,
A fluorescent sheet or film was produced by extrusion molding.

The fluorescent sheet or film was cut into a rectangle of 5 cm × 10 cm, and a white pigment-containing coating agent having a size of 1 cm × 5 cm was applied to the central portion, or an adhesive vinyl tape was attached to form a display pattern. Under the indoor conditions, five evaluators evaluated the visibility of the display pattern using the coated or adhered reflective surface as the display surface, and the results are shown in Table 1.

Evaluation by visual observation is strong fluorescence, especially the display pattern looks bright, and the ones evaluated by all the evaluators as excellent in gaze are marked with ◎, a fairly strong fluorescence is observed in the display pattern, and it is evaluated as bright Those evaluated by all of the people are indicated by ○, fluorescence is observed in the display pattern, and when evaluated by a majority of the evaluators when it looks bright △ is indicated, fluorescence is not observed in the display pattern, or fluorescence is observed but weak , What was evaluated by the majority of evaluators as poor in gaze ×
Indicated by the mark.

The display pattern was clearly displayed with the white coating agent and the white pressure-sensitive adhesive tape having high reflectance, while the display pattern was formed with the low reflectance, and the evaluation was low.

The white coating agent could be removed from the fluorescent film or sheet by wiping it with a damp cloth and peeling off the adhesive tape, and a new display pattern could be formed.

Examples 12 to 13 and Comparative Examples 5 to 6 The orange fluorescent sheet prepared in the same manner as in Example 1 was cut into the size shown in Table 2, and the size of 1 cm × 2 cm was cut in the center or the entire surface. Further, the white coating agent used in Example 1 was applied and evaluated in the same manner as in Example 1, and the results are shown in Table 2.

When the area of the display pattern was 70% or less with respect to the area of the fluorescent film or sheet, the visibility of the display pattern was excellent, but when it was 70% or more, the visibility was poor.

Further, the white coating material could be removed from the fluorescent sheet by wiping it with a damp cloth, and a new display pattern could be formed.

Comparative Example 7 A display body was prepared in the same manner as in Example 1 except that the display pattern was formed using an aluminum vapor deposition film (Scotchcal film manufactured by Sumitomo 3M Co., Ltd.) having a silver mirror surface on the surface instead of the white coating agent. However, the display pattern did not look bright at all, and the visual evaluation result was x.

This aluminum vapor-deposited film having a silver mirror surface was excellent in the reflectance as a mirror, but the light diffusion reflectance in the present invention was very low, and the fluorescence reflectance was 0%.

[Effects of the Invention] According to the present invention, it is possible to obtain a fluorescent display which is easy to form a display pattern, and which has a strong luminescence due to the display pattern and which is excellent in visibility and interest. This is suitable as, for example, a display board that draws attention of a person in a dark room.

Further, since the display pattern can be easily corrected and changed, the yield in forming the display pattern can be increased, and the fluorescent film or sheet can be repeatedly used.

[Brief description of the drawings]

FIG. 1 is a sectional view of a display body according to an embodiment of the present invention. 1 ... Transparent synthetic resin film or sheet containing a fluorescent colorant, 2 ... Light diffusive and reflective material.

Continuation of the front page (56) References JP-A-63-301990 (JP, A) Actually developed JP-A-49-101680 (JP, U)

Claims (2)

(57) [Claims] 1. A display pattern is formed on a transparent fluorescent film or sheet by a light diffusive reflective material in close contact therewith, and the fluorescent reflectance of the light diffusive reflective material is 20% or more, and The total area of the display pattern is 70% or less of the area of the fluorescent film or sheet, and the mixing amount of the fluorescent colorant is 0.01 to 5% by weight with respect to the resin constituting the fluorescent film or sheet. Fluorescent display. 2. The fluorescent display according to claim 1, wherein the resin constituting the fluorescent film or sheet is a methacrylic resin.