JPH0452601A - Optical condensing parts - Google Patents

Abstract

PURPOSE:To obtain the optical condensing parts to which any materials are applicable as transparent bodies and which do not degrade light transmittance by providing a layer contg. a material which is made to glow by light on the surface of a base body consisting of a transparent material. CONSTITUTION:The transparent base body 1 may be any materials, insofar as the materials can transmit light; more particularly transparent plastic, glass and quartz are preferable. While the shapes of the transparent base body are conceivably a plate, circular cylinder, square cylinder, waveguide, etc., the shapes are not particularly limited. The luminous material 2 is required to be the material, such as fluorescent material, which emits light of itself when irradiated with light. The fluorescent material is more particularly preferable. While the refractive index of this luminous material or the material to be mixed with the luminous material is not particularly limited, the refractive index is preferably lower than the refractive index of the transparent body. The lower refractive index is more preferable as the transmission efficiency of light is better. The part where the light is emitted and the part where the light is conducted are distinctly separated by forming the material which emits light on the outer side of the transparent body in such a manner, by which the transmission efficiency is improved and the long-distance light transmission is allowed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a light condensing component used in daylighting devices, optical sensors, and the like.

[Prior Art] It has been known to use plastics such as PMMA and PC with fluorescent substances added as light guides to collect sunlight or as light collecting parts for optical sensors. . However, a light guide obtained by adding a fluorescent substance to a transparent material has a reduced transmittance and poor transmission efficiency. Furthermore, it is extremely difficult to add fluorescent substances to glasses other than transparent plastics and quartz glass. Fifth
The figure shows the conventional method.

In other words, when light from a light source such as sunlight irradiates a transparent object,
A fluorescent substance contained in the transparent body emits light, which propagates inside the transparent body and is focused at an end of the transparent body.

[Problems to be Solved by the Invention] Conventional methods use a transparent material with a fluorescent substance added to it, but if a large amount of fluorescent material is added to the transparent material, the light transmittance of the transparent body decreases and the transmission distance increases. If the length is too long, the transmission efficiency will be poor. Also, when glass or quartz glass is used as the transparent material, it is extremely difficult to add a large amount of fluorescent material.

An object of the present invention is to provide a method that can use any material as a transparent body and can produce a light condensing component without reducing the light transmittance of the transparent body.

[Means for Solving the Problems] The present invention has been made to solve the above-mentioned problems,
The present invention provides a light condensing component characterized in that a layer containing a substance that emits light when exposed to light is provided on the surface of a substrate made of a transparent material.

As the substrate made of a transparent material (hereinafter referred to as transparent substrate) in the present invention, a plate made of a transparent material such as glass or plastic, or a columnar body such as a cylinder or a prism can be selected.

Hereinafter, the present invention will be explained according to examples.

However, the present invention is not limited to this. 1st
2 are cross-sectional views showing the structure of the present invention, in which 1 is a transparent substrate (plate-like body), 2 is a layer containing a luminescent substance, and 3 is a transparent layer having a lower refractive index than the transparent substrate. show.

The transparent substrate 1 may be of any material as long as it can transmit light (transparent plastic, glass, and quartz are particularly preferable. The shape of the transparent substrate 1 may be a plate, a cylinder, a prism, a waveguide, etc., but in particular, is not limited to.

The luminescent substance 2 needs to be a substance that emits light by itself when irradiated with light, such as a fluorescent substance, and a fluorescent substance is particularly preferable. The luminescent material can be coated directly on the surface of the transparent body, or mixed with another substance and coated on the surface of the transparent substrate. The refractive index of the luminescent substance or the substance to be mixed with the luminescent substance is not particularly limited, but it is preferably lower than the refractive index of the transparent body, and the lower the refractive index, the better the light transmission efficiency.

The transparent body 3 preferably has good light transmittance, and its material is preferably plastic, glass, quartz, or the like. The refractive index is required to be lower than that of the transparent substrate 1, and a lower refractive index is desirable.

[Function] In the present invention, by forming a layer containing a light-emitting substance on the outside of the transparent substrate, the light-emitting part and the light-guiding part are clearly separated, improving transmission efficiency and transmitting light over long distances. It enables transmission.

Additionally, in the past, it was difficult to add fluorescent substances to glass and quartz, making it impossible to create light concentrators, but the method of the present invention makes it possible to use glass and quartz as light concentrators. It became. Quartz has 100 times less transmission loss than conventional plastics, significantly improving transmission efficiency over conventional products and enabling long-distance transmission.

[Example] 1. Thickness 5olII+, length 100mm x 500m
m glass plate (refractive index 1.52) was used as a transparent substrate, UV-curable fluoroacrylate resin (refractive index 1.3
8. Fluorescent dye (manufactured by BASF, Red3)
39) was added to a thickness of 10 μm on both sides of the glass plate, and then the fluoroacrylate resin was irradiated for 2 seconds using a [JV Clamp 3.2kW Ok Seisakusho Co., Ltd.] to cure it. Thereafter, aluminum tape was adhered to three of the end faces of the plate as a reflective film. When this plate was irradiated with sunlight from above, the red light emitted from the remaining end face of the plate was focused and emitted.

2. A quartz rod with a diameter of 30 + + + mφ was heated to about 2000 °C and stretched to an outer diameter of 1 mm, and then coated with UV-curable fluoroacrylate resin (refractive index 1.38, manufactured by Asahi Glass Co., Ltd.) to a thickness of 5 μm. Immediately thereafter, it was cured using a UV lamp. Furthermore, on the outer periphery, fluorescent dye (BASF IJ
Red339) was added to a thickness of S μm and immediately thereafter cured using a UV lamp. The above steps were performed simultaneously using a drawing device to obtain a quartz core/plastic clad optical fiber.

This quartz fiber had a length of 500 m, and when this fiber was placed outdoors and irradiated with sunlight, red light emitted from the fluorescent dye was obtained from the end face of the fiber.

[Effects of the Invention] According to the present invention, a light-concentrating component can be obtained by providing a layer containing a light-emitting substance on the outside regardless of the shape as long as the base is made of a transparent material. have an effect.

In particular, glass and high transmittance quartz glass, which were previously unusable, can be used, making it possible to improve light collection efficiency and increase transmission distance.

[Brief explanation of the drawing]

FIGS. 1 and 2 are cross-sectional views of an embodiment showing the structure of the present invention. FIGS. 3 and 4 respectively show Example 1. It is a perspective view of the light condensing component of Example 2, and FIG. 5 is a sectional view of the conventional example. 1... Transparent substrate 2 - Layer containing a luminescent substance 3... Layer 4 with a lower refractive index than the transparent substrate - Reflective film 2. mouth

Claims (1)

[Scope of Claims] 1. A light condensing component, characterized in that a layer containing a substance that emits light when exposed to light is provided on the surface of a base made of a transparent material. 2. The light condensing component according to claim 1, wherein the layer containing the light-emitting substance has a refractive index lower than the refractive index of the base made of a transparent material. 3. The light condensing component according to claim 1, wherein a transparent layer having a refractive index lower than that of the base is provided between the base made of a transparent material and the layer containing a light-emitting substance.