JPS628102A - Transparent-bead embedded type recurrent reflecting film body - Google Patents

Abstract

PURPOSE:To facilitate manufacturing work and to color a transparent film before and after the manufacturing work according to the possibility of the coloring by making the back pat of a transparent bead adjoin to a reflecting film and covering the front part of the transparent bead with the transparent film which substantially equal thickness. CONSTITUTION:A recurrent reflecting film body reflects light incident through an air layer recurrently to the air layer through the refraction of the boundary surface between the air layer and transparent film 12, the refraction of the boundary surface between the transparent film 12 and the front surface of the transparent bead 10, the equal-angle reflection of the boundary surface between the rear surface of the transparent bead 10 and the reflecting film 14, the refraction of the boundary surface between the front surface of the transparent bead 10 and transparent film 12, and the refraction of the boundary surface between the transparent film 12 and air layer. Consequently, the manufacturing work is facilitated and the coloring is possible both before and after the manufacture working.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a transparent sphere for converting the surfaces of road sign boards, road markings, stickers for automobiles and bicycles, clothing, accessories, etc. into retroreflective surfaces. This invention relates to an embedded retroreflective film body.

[Conventional technology]

As illustrated in FIG. 2, this type of transparent sphere-embedded retroreflective film body has a reflective film ( reflective layer)
α4) K It is known that the front part (front part) of the transparent sphere (JQ) is exposed without powder while being adjacent to it.This retroreflective film body is.

The light incident through the air layer is refracted at the interface between the air layer and the front surface of the transparent sphere a, and the back surface (rear surface) of the transparent sphere σ0
The incident light is reflected into the air layer substantially parallel to the incident light through conformal reflection at the interface between the transparent sphere QO and the reflective film α♦ and refraction at the interface between the front surface of the transparent sphere QO and the air layer.

In addition, as an example of this type of retroreflective film, as illustrated in FIG. At the same time, the front part of the transparent sphere aCfi is covered with a lower transparent membrane (
A retroreflective film body coated with an upper transparent layer (12a) is also known. A retroreflective film body that is coated with an upper transparent layer (12a) refracts incident light at the interface between the air layer and the upper transparent film (12a), and
122L) and the front surface of the transparent sphere α1, refraction at the interface between the back surface of the transparent sphere QO and the lower transparent film (121)), and the lower transparent film (121)) and the reflective film αa.
Conformal reflection at the interface with the lower transparent film (121
)) and the back surface of the transparent sphere αQ, refraction at the interface between the front surface of the transparent sphere αq and the upper transparent film (12&), and refraction at the interface between the upper transparent film (12L) and the air layer. It is retro-reflected into the air layer.

[Problem that the invention seeks to solve]

Among the above-mentioned known retroreflective films, the former has a single-layer structure and is therefore easy to manufacture, but since there is no part that can be colored, it cannot be colored after manufacturing. I have a problem.

In addition, the latter has the advantage that the upper transparent film (12a) and the lower transparent film (1211) can be colored, so it can be colored even after the manufacturing process. In order to reflect light conformally at the interface between the lower transparent film (12tl) and the reflective film (Ill), the thickness of the lower transparent film (121) must be finished with high precision. The problem is that it is difficult to process and requires a high-performance manufacturing machine.

[Means for solving problems]

According to the present invention, the above problem can be solved by making the back part of the transparent sphere adjoin the reflective film (reflection layer) 041 and making the front part of the transparent sphere α0 have a substantially equal thickness □ This problem is solved by a transparent sphere-embedded retroreflective film body which is coated with a transparent film (transparent layer) 4 having a spherical surface parallel to the front surface of the upper transparent sphere (IQ).

[Effect]

The retroreflective film body according to the present invention refracts light incident through the air layer at the interface between the air layer and the transparent film (6), refracts it at the interface between the transparent film and the front surface of the transparent sphere αQ, and Conformal reflection at the interface between the back surface of the sphere αQ and the reflective film αYU, refraction at the interface between the front surface of the transparent sphere Q (J and the transparent film), and the interaction between the transparent film □□□ and the air layer. It is retroreflected into the air layer through refraction at the interface.

〔Effect of the invention〕

Since the retroreflective film body according to the present invention has a two-layer structure that does not require particularly high precision formation, it is easy to manufacture and process, and the possibility of coloring the transparent film (6) is reduced. , Coloring can be applied before and after manufacturing.

[Example 1] After coating the surface of a 25μ thick polyester film with a temporary fixing adhesive, glass-made transparent spheres with an average diameter of 50μ and a refractive index of 2.23 were scattered, and the whole was heat-treated to A transparent sphere is temporarily attached to the surface of the film with about a hemispherical part exposed, and then aluminum is vapor deposited on the surface including the exposed part of the transparent sphere to form a reflective film, and then on this reflective film,
After applying and drying a hot melt adhesive containing a white pigment, the white tuck fabric forming the base is adhered by hot pressure, and then the polyester film is peeled off together with the temporary adhesive to form a transparent sphere. Finally, a transparent resin with a relatively high viscosity, low solid content, and a refractive index of 1.54 is uniformly applied to the entire surface including the exposed part of the transparent sphere, and then dried. By forming a transparent film with a uniform thickness of about 10 μm on the Tetron taffeta fabric, about a hemispherical part of the transparent sphere on the anti-fabric side is destroyed by the transparent resin film. The retroreflective film of the present invention was formed in close contact with the aluminum vapor deposited film.

This retroreflective film body had high retroreflectivity and a wide reflection angle.

When Tetoron taffeta fabric with a retroreflective film was dyed, the same coloring (dying) as ordinary fabric was achieved.

[Example 2] A reflective film was formed by applying an adhesive containing fine aluminum powder to the surface of a 25 μm thick polyester film forming the base, and then a reflective film with an average diameter of about 50 μm and a refractive index of 2,000 μm was coated on the adhesive. After scattering the glass transparent spheres in step 2, heat treatment is performed to adhere the transparent spheres to the surface of the polyester film with the minimum amount of embedding to ensure adhesive strength, and then to the entire surface including the exposed surface of the transparent spheres. A transparent resin with a relatively high viscosity, low solid content, and refractive index of 1.54 is uniformly coated and dried to form a transparent film with a uniform thickness of about 6 μm, which coats the surface of the polyester film. The retroreflective film body of this invention was attached to.

This retroreflective film had a wide reflection angle and exhibited high retroreflectivity.

[Example 3] A colored transparent adhesive was applied thinly to the aluminum-deposited surface of a 25μ thick polyester film on which aluminum was deposited, and a layer with an average diameter of 30μ and a refractive index of 2.
After scattering the glass transparent spheres in step 2, heat treatment is performed to adhere the transparent spheres onto the aluminum vapor-deposited surface with some of the transparent spheres buried, and then the solid content is applied to the entire surface including the exposed surface of the transparent spheres with a relatively high viscosity. The retroreflective film of the present invention can be applied to the surface of a polyester film by uniformly coating a colored transparent resin with a low refractive index and a refractive index of 1.54 to a dry thickness of about 6 μm, and then drying it. Formed.

This colored retroreflective film had high retroreflectivity and a wide reflection angle.

[Brief explanation of the drawing]

FIG. 1 is an enlarged sectional view of an example of a retroreflective film according to the present invention, and FIGS. 2 and 3 are enlarged sectional views of two hooks of a conventional retroreflective film. al...Transparent bulb (b)...Transparent F41 04)...Reflective film approval Ide Kogyo Co., Ltd.

Claims (1)

[Claims] A transparent sphere-embedded retroreflective film body in which the back part of a transparent sphere is adjacent to a reflective film, and the front part of the transparent sphere is covered with a transparent film of substantially the same thickness.