JPS5927618Y2 - Light diffusing cover material - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a light-diffusing covering material.

2. Description of the Related Art In display systems or illuminations using various light sources, it is known to use a light diffusing cover to convert a point or linear light source into a uniform planar light emitting light source.

FIG. 1 shows an example in which a light-diffusing cover b is attached to a light-emitting diode a, in which light emitted from a point light source of the light-emitting diode a is scattered by the light-diffusing cover b, and the cover surface is converted into a surface light source. The image of the point light source itself is not displayed on the cover surface.

In FIG. 1, C indicates a frame edge for fixing the light-diffusing cover b to the package body d of the light emitting diode.

Conventionally, the light diffusion means of the light source used is a cover molded into a rigid specific shape as described above, and it is necessary to manufacture many types of unique shapes for each application. .

For this reason, a transparent film is provided on the surface of the light diffusion layer, and an adhesive layer with a light diffusion function is provided on the back surface of the light diffusion layer.
Roll up the cover material with release paper temporarily attached to the adhesive layer,
It has been proposed to unwind the cover material from this rolled body, punch it out into a predetermined cover shape, remove the release paper from the punched piece, and adhere the adhesive surface to the package body of the light emitting diode.

A protective layer of transparent plastic is provided on the surface of this cover material, but if the protective layer is scratched during the above-mentioned winding, unwinding, or punching of the cover material, depending on the condition of the scratch, the area near the scratch may be damaged. There is a problem in that the parts become white and the optical properties are actually deteriorated due to this whitening.

The light-diffusing covering material according to the present invention has a structure that can eliminate the above-mentioned problems, and a transparent film is provided on the surface of the light-diffusing layer, and a protective film that is peeled off during use can be peeled off on the surface of the transparent film. The present invention is characterized in that an adhesive layer provided with a light-diffusing function is provided on the back side of the light-diffusing layer, and a release paper is temporarily attached to the adhesive layer.

The present invention will be explained below with reference to the drawings.

In FIG. 2, 1 is a flexible light-diffusing layer with or without a colorant added thereto.

2 is an adhesive layer provided with a light diffusion function, and may be colored.

3 is a release paper temporarily attached to the adhesive layer, and may be omitted.

4 is a transparent film layer. 5 is a protective film removably provided on the surface of the transparent film layer.

6 and 6' are colored layers, which may be omitted.

In the above, in order to impart a light diffusing function to the adhesive layer, a light diffusing material may be added.

The same light diffusing material as the light diffusing material of the light diffusing layer can be used for this light diffusing material.

For example, titanium oxide, calcium carbonate, talc, silica powder, glass beads, and various inorganic or organic pigments can be used. In the case of an uncolored light diffusing material, a mixture of pigments and dyes can be used.

The light diffusion layer 1 and the adhesive layer 2 can also be colored in different colors.

The base resin of the light diffusion layer 1 and the transparent protective film 4 include polyethylene, polypropylene, polyester, polycarbonate, polyacrylate, polystyrene, polyvinyl chloride, polyvinyl chloride, diacetate,
triacetate, acetic acid, cellulose butyrate, cellophane,
Nylon, polyurethane, etc. can be used.

In the laminate of the present invention, although the light diffusing effect is exhibited by both the light diffusing layer 1 and the adhesive layer 2, compared to the case where the light diffusing effect depends only on the light diffusing layer, the light diffusing layer 1 The amount of light diffusing material added can be reduced.

Therefore, the flexibility of the light diffusion layer 1 can be sufficiently guaranteed.

Furthermore, the reduction in flexibility caused by adding a light diffusing material to the adhesive layer 2 is essentially eugenic.

Since the amount of light diffusing material added to the adhesive layer 2 can be kept to a small amount due to the light diffusion sharing effect of the light diffusing layer 1, the adhesive force of the adhesive layer can be sufficiently maintained.

The light-diffusing cover material according to the present invention has the above-mentioned structure, and is flexible and can be rolled up and stored, unrolled when used, and punched into a predetermined cover shape.
After removing the release paper, this punched piece can be attached to the package body of the photodiode or the light source cover, and a light diffusing cover can be easily provided.

In addition, even if the surface is scratched during punching, the scratches will only be on the protective film, avoiding scratches on the light-diffusing cover material. After pasting it, it will be removed.
The scratches described above do not adversely affect optical properties.

Furthermore, since the light-diffusing material is added to the adhesive layer, the amount of light-diffusing material added to the light-diffusing layer can be reduced accordingly, and the tensile strength of the light-diffusing layer can be increased accordingly.

Therefore, it is possible to reduce the need to thicken the protective film to ensure the tensile strength of the entire cover material. ), even when using a protective film,
The thickness of the cover material before punching can be made sufficiently thin so that punching can be performed with excellent precision. do).

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a conventional light diffusing structure, and FIG. 2 is an explanatory diagram showing a light diffusing structure according to the present invention. In the figure, 1 is a light-diffusing layer, 2 is an adhesive layer added with a light-diffusing material, 4 is a transparent film layer, and 5 is a protective film.

Claims (1)

[Scope of utility model registration request] A transparent film is provided on the surface of the light diffusion layer, a protective film that is peeled off during use is provided on the surface of the transparent film in a removable manner, and an adhesive layer provided with a light diffusion function is provided on the back surface of the light diffusion layer. A light-diffusing cover material, characterized in that a release paper is temporarily attached to the adhesive layer.