JP3023032U - Rod-shaped luminous body - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] To provide a safe rod-shaped light emitter that emits light of any color without any electric energy being applied to the light emitting part itself, without heating. [Structure] A rod-shaped transparent body having a white diffused reflection layer surface 3 on a part of its side surface, and a light-collecting light-emitting diode 1 arranged at intervals on at least one end surface so that its main optical axis faces each other. Luminous body.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a novel rod-shaped illuminator, and more particularly to a rod-shaped illuminator that can be safely handled without any voltage being applied to the illuminator and does not cause heat generation. Provide a luminous body suitable for interior lighting equipment, illuminated signboards, auxiliary lighting indicating the presence of stairs, handrails, etc.

[0002]

[Prior art]

 Until now, neon tubes and fine fluorescent tubes have been used for rod-shaped light emitters. A high voltage had to be applied to make the neon tube emit light, specialized knowledge was required for the installation work, it could only be used in places where it could not be touched by the human body, and a great deal of cost was required for maintenance. And Fluorescent tubes can emit light at a relatively low voltage compared to neon tubes, but glass tubes are easily damaged, the wall temperature rises, and the length and emission color cannot be freely selected. There wasn't. For linear illumination, there is also a method of arranging and lighting a small tungsten lamp or light emitting diode that can be driven at a low voltage of 24 V or less, but these are only intermittent bright points, and they are continuous lines or rods. It was not possible to obtain a luminous body, and the wiring was complicated and maintenance was troublesome.

[0003]

[Problems to be solved by the device]

 An object of the present invention is to provide a rod-shaped light emitting body that solves the above-mentioned problems of the prior art.

[0004]

[Means for Solving the Problems]

 As a result of earnest studies by the present inventors in order to achieve the above object, as a result, a glass round bar or an acrylic resin square bar with a smooth surface or a part of the longitudinal surface of a transparent resin deformed bar such as polystyrene or polycarbonate is formed. A transparent or continuous white scattering layer is provided in the longitudinal direction, and the light-collecting light-emitting diode light source is arranged so that the main optical axis faces the end face of the bar material and there is a space between them. It was found that the excellent rod-shaped luminescent material was obtained by uniformly reflecting and emitting in the luminescent color of.

Thus, according to the present invention, it is possible to obtain a cold light-emitting body which is independent of the light source unit and the main body of the light-emitting body, is easy to install and maintain, and does not generate heat. As a rod-shaped body, the ratio of the short diameter or short side of the cross section to the long diameter or long side is approximately 1 to 3 or less, and the length is preferably 10 times or more of the short diameter or short side. When a wide white diffuse reflection layer is provided on the long side surface of the rod, most of the incident light is reflected by the diffuse reflection layer near the incident end face and emitted from the rod body, emitting light from the incident end face to a long distance. do not do.

As a light-emitting diode light source having a light-collecting property, a light-emitting diode called a transparent high-brightness type such as red, blue, yellow, orange, and green coloring, a light-emitting diode with a lens, or a light-emitting diode with a bow-shaped lens is suitable. is there. In the case of a light emitting diode that produces a focused beam close to a parallel beam, the distance between the diode and the transparent rod can be separated by a considerable distance, but in the case of a divergence type diode, the divergence diameter of the main beam is If the distance is set so that it becomes close to the cross-sectional area of, the luminous efficiency of the bar increases.

The optimum interval is approximately 1 mm to 20 cm, although it depends on the cross-sectional shape and refractive index of the rod and the light-collecting performance of the light emitting diode used, and the critical angle that causes total internal reflection at the air interface inside the rod. The above-mentioned incident light components are appropriately adjusted so as to increase. In addition, if a plurality of condensing light-emitting diodes with different emission wavelength distributions are arranged on the end face of the rod so that their main optical axes face the end face, and they are driven by multiple power sources with different light emission fluctuation periods, respectively. A rod-shaped light emitting body that emits light with a color change is obtained.

In order to form the white diffuse reflection layer of the present invention, it is prepared by coating a part of the side surface of the bar material with a commercially available white paint or printing ink, or by providing fine joints according to the method of Japanese Patent No. 1872167. it can.

If a reflective layer is provided on a part of the side surface of the transparent rod with a uniform width from the light incident end face to the tip of the rod, the luminance near the light incident portion is high and the luminance gradually decreases as the distance increases. If the area near the light section is thin and the area near the tip is wide, the entire rod can be made to emit light uniformly. By providing an intermittent pattern or providing a reflective layer only in a part in the longitudinal direction, it is possible to emit light according to the shape of the reflective layer.

[0010]

[Action]

 Light from the light-emitting diode light source, which is appropriately collected, enters the transparent rod through the end face through the air gap, and incident light that exceeds the critical angle of the rod repeats total reflection at the air interface on the side of the rod and is not incident. Although the light diverges toward the edge, the incident light that is scattered and reflected by entering the white diffuse reflection layer provided on a part of the side surface in this process is rich in scattering reflection components below the critical angle and Radiated into the air from the side. When observed from the side opposite to the reflective layer, it looks as if the entire rod were emitting light uniformly in the color of the light emitting diode.

An appropriate light-condensing ability is effective for efficiently introducing the light from the light source into the transparent rod material, and the gap between the transparent rod material and the light source blocks the conduction heat and the flow path of the cooling air of the light source section. The light source and the light emitter are independent, so installation is easy. If a reflecting material is provided on the end face opposite to the incident end face, the light emission brightness of the rod increases, and if a condensing light source is provided at both ends of the transparent rod, the light emission brightness is further improved. The rod-shaped luminous body of is obtained. The transparent rod can be deformed by bending if necessary, or multiple rods can be joined and branched within a limit angle that keeps the incident light to totally reflect.

[0012]

【Example】

 Example 1 A commercially available white paint was applied to one side surface of a square bar of polymethylmethacrylate having a side length of 6 mm and a length of 2 m to a thickness of about 120 μm and dried. Polish one end face smoothly, turn on the high brightness red light emitting diode TLRA179RS made by Toshiba Corporation at 3.8V20mA, and the main optical axis is directed to the center of the square rod from a distance of 10mm from the polished end face of the square rod. It was irradiated so that it would be covered. The side surface of the square rod glowed red uniformly, and the light emitting shape was also changed according to the bending deformation of the square rod. When the tip of the lens of the light emitting diode was brought into close contact with the end face of the rod, the emission brightness of the rod decreased.

Example 2 A white paint was partially coated on the side surface of a polycarbonate round bar having a diameter of 20 mm and a length of 1 m, and the width was about 10 mm and the length was about 5 cm at intervals of about 5 cm parallel to the longitudinal direction. A 90-100 micron thick white scattering reflective layer was provided. The red light emitting diode (trade name TRLA189RS) and the green light emitting diode (trade name TLGC190 PRS) manufactured by Toshiba Corp. are connected to a variable voltage power source, respectively, and the applied voltage is alternately changed so that the current does not exceed 20 mA. As a result, the round bar emitted light while changing its color to green, yellow, orange and red in the white scattering reflection layer portion.

[0014]

[Effect of device]

 The rod-shaped light emitting device of the present invention efficiently captures the radiated light from the light source into the transparent rod material and is highly efficient. Moreover, the light emitting part is completely cut off from the light source part, and the electric wiring is not taken into consideration when installing or using. It is easy to carry out and maintain.

[Brief description of drawings]

FIG. 1 is a sectional view showing an example of a rod-shaped light emitting device of the present invention.

FIG. 2 is a sectional view showing another example of the rod-shaped light emitting device of the present invention.

FIG. 3 is a cross-sectional view showing an example of a white diffuse reflection layer provided on the rod-shaped light emitting device of the present invention and an external view seen from the side.

[Explanation of symbols]

 1 Light-Emitting Diode 2 Transparent Rod 3 White Diffuse Reflection Layer

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location G09F 13/20 GH01L 33/00 LM

Claims (2)

[Scope of utility model registration request] 1. A main optical axis of at least one light-collecting light-emitting diode facing at least one end surface of a rod-shaped transparent body having a smooth irregular surface having a white irregular reflection layer surface on a part of a side surface thereof with a gap. Rod-shaped light emitters arranged in such a manner. 2. The rod-shaped rod according to claim 1, wherein a plurality of light-collecting light-emitting diodes are made of a combination of different emission wavelengths, and are driven by an independent power source so that the light emission fluctuation periods are different from each other. Luminous body.