JPH0423272Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) 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 the 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) Conventional light reflective signs using this type of retroreflector are molded bodies made of glass or hard plastic material, and although they are not in practical use. In many cases, the size of the triangular pyramids (hereinafter referred to as triangular prisms) is 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 applicant previously obtained a retroreflective film sheet in which about 1000 to 3600 micro triangular prisms/cm ² were cut on one side of a soft sheet (thickness 0.2 mm) of acrylic resin or polycarbonate resin. 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 Problems) The present invention consists of a first retroreflector made of a soft resin film sheet on which 1000 triangular prisms/cm ² or more are formed, a colored transparent plate, and a perforated Provided is a light reflective sign in which an opaque plate and a second retroreflective plate having the same effect as the first retroreflective plate are stacked one after another, and these are integrally sealed inside a case whose at least one side is transparent. do.

(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 sign, an opaque plate with through holes arranged at intervals, a colored transparent plate and a retroreflector underneath the opaque plate function effectively. That is, by utilizing the partially transmitted light in the upper layer retroreflector and arranging the plate on the back side thereof, the previous transmitted light passes through the through hole of the plate, and the colored transparent plate below it passes through the through hole of the plate. After passing through the filter action area, the light is retroreflected by the retroreflector in the lower layer and directed toward the retroreflector in the upper layer. Since the colored light is filtered by the filter and is reflected only from the through-hole portion, the colored light from the through-hole portion that transmits it from the back side is added to the fully reflected light from the uppermost layer retroreflector. When the light is mixed, the reflected image becomes a pattern of scattered colored patterns made up of small holes. This makes the reflected image pattern different from that of normal headlight light, making it more useful as a light reflecting sign.

(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 cover plate 2, and the following four members are installed. It's sealed.

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, an opaque plate 6 with through holes 5 arranged at intervals, and another of the above-mentioned elements. A retroreflector 7 is provided.

The retroreflectors 3 and 7 are 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 .

In addition, when stacking these members as shown in the third diagram and sealing them inside the case, the structure is watertight enough to prevent rainwater from entering the case, considering weather resistance when installed outdoors. be.

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°).
Approximately 80% of the light is reflected by the retroreflector 7 directly below it as shown in Figure 4, and the light that has passed through it is reflected by the perforated opaque plate 6 below it, except that it is directed toward the through hole 5. While most of the portion is absorbed, the portion that passes through the through holes 5 of the perforated opaque plate 6 is filtered by the colored transparent plate 4 and is absorbed by the retroreflector 3 in the lower layer.
reach.

The light that has reached the reflector 3 is reflected and refracted by the triangular prism on the back surface in the same way as described above, becoming retroreflected light in the direction of the incident light, and passes through the colored transparent plate 4 and the through hole 5 of the perforated opaque plate 6 again. Then, the colored light is emitted from the transparent lid plate 2. Therefore, the colored reflected light that passes through the uppermost layer retroreflector 7 from the back side is mixed with the light reflected on the entire surface of the reflector 7, and the reflected image becomes a colored pattern of dots made of small holes. This is the pattern that exists.

(Effects of the invention) As described above, the sign according to the invention uses two retroreflectors in which micro triangular prisms are densely formed on one side of a soft synthetic resin film sheet, and An opaque masking plate with through holes arranged at intervals and a colored transparent plate as a filter are interposed between the mountings. Therefore, the retroreflector has unparalleled reflection brightness even for incident light at a relatively wide angle, and moreover, the light that has passed through the upper layer retroreflector is reflected by the through-hole portion of the opaque plate. While the light is reflected by the lower layer retroreflector and reflected back, it is colored by the colored transparent plate and mixed with the light completely reflected by the upper layer retroreflector, so that the sign is dotted with colored patterns. As a result, it is possible to obtain a unique reflected image pattern, demonstrating an excellent sign function and attracting the attention of drivers.

Furthermore, since the reflector is made of a soft film sheet, its shape can be freely set.
Accordingly, the sign according to the present invention not only has excellent functionality, but also has a large degree of freedom in shape, such as the case body, that is, the sign itself, can be configured into any shape. In addition, it can be put to practical use as a wide range of light-reflecting signs such as tail reflectors and even safety badges.

[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, 3 and 7...
Retroreflector, 4... colored transparent plate, 5... transparent hole,
6... Opaque board.

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Claims (1)

[Scope of utility model registration request] A first retroreflector made of a soft resin film sheet with 1000 triangular prisms/cm ² or more formed on its surface, a colored transparent plate, a perforated opaque plate, and the same as the first retroreflector. 1. A light-reflecting sign comprising: a second retro-reflective plate having an effect, and a second retro-reflecting plate, which are stacked one after another, and which are sealed integrally within a case whose at least one side is transparent.