JPH11180211A - Phosphor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remarkably improve the light emitting luminance by laminating a fluorescent layer on a rear face of a transparent layer comprising a V-shaped groove on a surface which totally reflects the light excluding a ray of light of which the angle of incidence is rectangular. SOLUTION: When a phosphor 10 is exposed to the light of day in daytime, a ray of light passing through a surface of the transparent layer 12 at right angle reaches a fluorescent layer 11, and the optical energy is accumulated therein. When the ray of light is not irradiated to the phosphor 10 at night, the optical energy accumulated in the fluorescent layer 11 is excited, and the light is emitted outward. The rays of light not directed to the surface of the transparent layer 12 at right angle among the rays of light, are totally reflected by the surface of the transparent layer 12 one or several times, and finally released from a pair of bottom parts 13a of the V-shaped groove 13 in a state that a beam 14 is formed. By collecting the light on the pair of bottom parts 13a of the V-shaped groove 13, the luminance can be remarkably improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a phosphor, and more particularly, to a phosphor used as a mall or a road sign mounted on a vehicle body.

[0002]

2. Description of the Related Art As disclosed in, for example, JP-A-5-173008 and JP-A-8-99384, there has been provided a phosphor or a luminance structure which conventionally emits light stored at daytime at night. Have been. These phosphors or luminance structures are used as malls or road signs mounted on the vehicle body.

[0003]

However, the luminous brightness of these phosphors or luminous structures depends on the performance and quantity of the luminous material contained therein, so that they cannot be put to practical use. Further, in order to improve the light emission luminance, it is necessary to use a backlight as disclosed in Japanese Patent Application Laid-Open No. 8-313903, and it cannot be used as a mall.

[0004] Therefore, an object of the present invention is to provide a phosphor or a luminance structure which does not have such a problem.

[0005]

Means for Solving the Problems In order to solve the above technical problem, the technical means adopted in the invention according to claim 1 is that a V-shaped groove is formed on a surface which totally reflects light other than a light beam having an incident angle of a right angle. And a phosphor formed by laminating a fluorescent layer on the back surface of the transparent layer and the transparent layer.

[0006]

In the structure of the first aspect, most of the light emitted from the fluorescent layer is totally reflected once or several times on the surface of the transparent layer to form a pair of planar bottom portions forming a V-groove. Is emitted to the outside. Thus, compared to the past,
Light emission luminance is remarkably improved.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the phosphor according to the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, the phosphor 10 has a rectangular phosphor layer 11. Thus, the fluorescent layer 11 is formed by extruding a resin stock solution mixed with a fluorescent pigment. As a fluorescent pigment, "Pikarico" from Chemtech Co., Ltd.
A commercially available product is used under the trade name, and acrylic is used as the resin. Instead of acryl, polycarbonate, polyester, polyamide, polystyrene, or the like can be used.

On the front surface of the fluorescent layer 11, the back surface of the transparent layer 12 is laminated. The transparent layer is a molded product formed by uniformly dispersing a fluorescent material in an acrylic resin, and its surface is polished. The transparent layer 12 formed as described above allows light rays incident at a right angle from the outside (from the inside) to the surface to pass through the inside (outside), while allowing other light rays to be totally reflected. Has become.

A V-shaped groove 13 is formed on the surface of the transparent layer 12. A pair of bottoms 13 a of the V-shaped groove 13 form a predetermined angle with respect to the surface of the transparent layer 12. Further, the pair of bottoms 13a of the V-shaped groove 13 is not polished, and the light beam that reaches the pair of bottoms 13a of the V-shaped groove 13 passes through as it is.

The phosphor 10 constructed as described above is exposed to light under the daylight in the daytime, the back, the surface of the transparent layer 12, and the light passing through at right angles to the surface. At 11, light energy is stored there. How much light energy is stored is determined by the amount of fluorescent pigment contained.

When the phosphor 10 is no longer irradiated with light rays at night, the light energy stored in the phosphor layer 11 is excited, and light is emitted outward. Of these rays, those that do not make a right angle to the surface of the transparent layer 12 are:
One or several times, it is totally reflected on the surface of the transparent layer 12, and finally, the beam 14 from the pair of bottoms 13 a of the V-shaped groove 13
Go out as if to do. That is, the light is collected on the pair of bottoms 13a of the V-shaped groove 13, so that the brightness is remarkably improved.

When a character or a picture is drawn on the surface of the transparent layer 12 so as to be close to the V-shaped groove 13, the character or the picture is
4, the sign function is markedly improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a phosphor according to an embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 10 phosphor 11 phosphor layer 12 transparent layer 13 V-shaped groove

Claims (1)

[Claims] 1. A phosphor comprising a transparent layer having a V-shaped groove formed on a surface for totally reflecting light other than a light beam having a right angle of incidence, and a fluorescent layer laminated on a back surface of the transparent layer.