JPH0423271Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a light reflecting sign that is effective for use in road signs, tail reflectors, etc.

(Prior Art) When a triangular pyramid consisting of three right triangles is made of a light transmitting material such as glass, it is already known that it is a so-called retroreflector that reflects parallel light rays incident at right angles to its base toward the light source. Are known. Various types of side road signs and the like using such retroreflectors have been put into practical use.

(Problems to be solved by the invention) Conventionally, light reflective signs using this type of retroreflector have been molded bodies made of glass or hard plastic materials, and have not been put into practical use. Most of the objects are triangular pyramids (hereinafter referred to as triangular prisms).
The size of the particles was about 1 piece/cm ² at most, and the number was limited to 20 pieces/cm ² due to processing constraints.

Therefore, in a reflector formed by continuously expanding such triangular prisms on a surface, due to limitations in the material and molding, the prism edges are not sharp enough, and
As a result, some gaps are created on the edges between each prism, and as a result, light absorption and diffusion occur at these edges and edges, resulting in a decrease in reflection efficiency and a pattern with stripes as a reflected image. , and had a partially glittering mosaic-like appearance.

On the other hand, the present applicant previously obtained a retroreflective film sheet in which approximately 1000 to 3600 triangular prisms/cm ² were cut on one side of an acrylic resin or polycarbonate resin sheet (thickness 0.2 mm). The sheet can be freely shaped into shapes by cutting, has excellent weather resistance, and has water repellency due to the dense microprisms on the prism-constituting surface.In particular, as shown in the attached reflective performance tables (1) and (2), It has unparalleled reflection brightness even over a wide range of light incident angles.

Therefore, the object of the present invention is to obtain an effective light-reflecting sign for use in road signs, etc., as one of the practical products using the above-mentioned retroreflective film sheet.

(Means for solving the problem) The present invention uses a retroreflector made of a soft resin film sheet with 1000 or more triangular prisms/cm ² formed on its surface, and a perforated reflector placed on the light incident surface side. To provide a light reflecting sign in which an opaque plate and a colored transparent plate interposed therebetween are integrally sealed in a synthetic resin case body whose at least one side is transparent.

(Function) A retroreflector made of a resin film sheet is
The light incident on the light incidence surface is reflected 360° and returned toward the light source. In this case, the reflection efficiency is more efficient as the angle of incidence is smaller, as shown in the performance tables (1) and (2) above, and moreover, the reflection efficiency is concentrated in the direction where the angle of reflection is perpendicular to the plane of incidence.

Therefore, when a sign with this arrangement is used as a side road sign or the like, the illumination of the headlights of a traveling vehicle makes it appear as if a high-intensity light source bulb had been installed.

High-brightness reflectors also create a risk that they may be mistaken for the headlights of an oncoming vehicle due to light scattering in weather conditions such as fog.

In order to prevent this and to exhibit the uniqueness as a marker, an opaque plate with through holes installed at intervals functions effectively. That is, by utilizing the narrow-angle concentration of retroreflected light in the retroreflector and arranging the plate on the light incident surface side, that is, on the light reflection optical path side, the reflection action is performed at the previous transparent hole portion. ,
Moreover, since the outline of the through-holes can be maintained clearly, the reflected image becomes a pattern in which small hole-shaped patterns are scattered. As a result, the reflected brightness can be adjusted and the reflected image pattern can be made unique, thereby further enhancing its usefulness as a light reflective sign.

Furthermore, by interposing a colored transparent plate between the perforated opaque plate and the reflector, a unique pattern consisting of colored scattered lights can be formed.

(Example) Next, the illustrated embodiment will be described.

Fig. 1 is an external perspective view showing an embodiment of the present invention, and Fig. 2 is an exploded perspective view thereof, in which an opaque case 1 made of synthetic resin is covered with a transparent lid plate 2, and the following three members are sealed: It has been done.

That is, the present invention includes a retroreflector 3 housed in the bottom of the case 1, a colored transparent plate 4 placed on the reflector 3, and a perforated opaque plate 6 with through holes 5 arranged at intervals. The retroreflector 3 is made of a soft synthetic resin film sheet on one surface of which the aforementioned triangular prisms are formed at a rate of about 1,000 to 3,600 per cm ² .

By stacking these members as shown in the third figure and sealing them inside the case, the structure is watertight enough to prevent rainwater from entering the case, taking into account weather resistance when installed outdoors.

In addition, this case 1 has a diameter of several tens of millimeters to several centimeters.
For small diameter ones, several of them are arranged in a concentrated manner for practical use.

According to the above-mentioned embodiment having such a configuration, the light is incident from the transparent cover plate 2 of the case 1 (the practical angle of incidence is 30°).
The part of the light that does not go toward the through hole 5 is mostly absorbed by the perforated opaque plate 6 in the lower layer, while the part that passes through the through hole 5 is filtered by the colored transparent plate 4. It reaches the retroreflector 3.

As shown in FIG. 4, the light that reaches the reflector 3 is reflected and refracted by the triangular prism on the back surface, becoming retroreflected light in the direction of the incident light, and passes through the transparent holes 5 of the colored transparent plate 4 and the perforated opaque plate 6. The light passes through the transparent lid plate 2 and emerges as colored light.

(Effects of the invention) As described above, the sign according to the invention uses a retroreflector in which micro triangular prisms are densely formed on one surface of a soft synthetic resin film sheet, and the light incident side of the reflector is Since the masking is performed by a perforated opaque plate with transparent holes arranged at intervals, the retroreflector has unparalleled reflection brightness even for light incident at a relatively wide angle. Since it is a part of the reflection, it is possible to adjust the overall amount of reflected light while maintaining strong reflected brightness in some parts, which is sufficient to alert drivers etc., and also under weather conditions such as smog. However, there is no excessive scattering phenomenon that would cause the outline of the sign itself to be lost.

Furthermore, by interposing a colored transparent plate between the reflector and the opaque plate, it is possible to maintain the unique pattern of the reflected image as a marker consisting of colored dotted lights, and exhibit an excellent marker function. do.

Furthermore, since the reflector is made of a soft film sheet, its shape can be freely set;
Accordingly, the case body, ie, the sign itself, can be configured in any desired shape. Therefore, the sign according to the present invention is not only superior in function, but also
Because it has a large degree of freedom in shape, it can be applied to a wide range of light-reflecting signs, such as road signs, tail reflectors, and even safety badges, and can be expected to be a product with high commercial value.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view showing an embodiment of the sign according to the present invention, FIG. 2 is an exploded perspective view of the sign according to the present invention, FIG. 3 is a vertical cross-sectional view of the assembled sign, and FIG.
The figure is a schematic diagram showing the light reflection state of the retroreflector in the sign according to the present invention. 1... Case, 2... Transparent lid body, 3... Retroreflector, 4... Colored transparent plate, 5... Through hole, 6...
Opaque board.

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Claims (1)

[Scope of utility model registration request] A retroreflector made of a soft resin film sheet with 1000 triangular prisms/cm ² or more formed on its surface, and a perforated opaque plate placed on the light incident side of the retroreflector.
A light reflective sign characterized in that a colored transparent plate interposed between these plates is integrally sealed inside a synthetic resin case whose at least one side is transparent.