JPS5933402A - Optical radiator - Google Patents

Abstract

PURPOSE:To diffuse and radiate effectively and uniformly propagated light with simple constitution by providing many bar-like bodies each having an approximately triangular sectional shape in contact with a photoconductor in parallel therewith and radiating the light through said bar-like bodies. CONSTITUTION:Many bar-like bodies 3 are disposed around a photoconductor 2 in contact with the outside circumferential surface thereof and in parallel with the photoconductor 2. The light transmitted through a photoconductor cable 1 is radiated in the radial direction of the photoconductor 2 through the bodies 3 in the photoconductor part 2. More specifically. the luminous flux density in the photoconductor 2 decreases successively along the advance direction of the light but the contact area between the photoconductor and the bar-like bodies increases correspondingly and the light having approximately uniform illuninance is radiated from the head parts (b) of the bar-like bodies. The propagated light is effectively and uniformly diffused and radiated with the simple constitution in the above-mentioned way.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a light radiator for effectively diffusing and emitting light transmitted through a light guide cable, etc. It consists of a large number of rod-shaped bodies having a substantially triangular cross-sectional shape, which are arranged parallel to the light guide in contact with the light guide, and a container made of a transparent or semi-transparent body that seals the rod-shaped bodies and the light guide, Light introduced into the light guide from one end of the conductor is effectively emitted to the outside of the container through the rod-shaped body.

Recently, we have entered an era of energy conservation, and research and development on the effective use of solar energy is being actively conducted in various fields. It means to use light energy as it is without converting it into other forms of energy such as thermal energy or electrical energy. From this point of view, the present applicant focused sunlight using a lens or the like, introduced it into a light guide cable, transmitted it to any desired location through the light guide cable, and created a light guide at that location. Various proposals have already been made regarding emitting light from cables for illumination.

Therefore, when trying to use solar energy for lighting as described above, the light propagating inside the optical conductor cable has directionality, so it is necessary to cut the end of the optical conductor cable. When light is emitted from the cut point, the radiation angle is usually about 46 degrees, which is quite narrow. In this case, it is not possible to provide satisfactory illumination by simply cutting the end of the optical conductor cable and emitting light from the cut point. Therefore, the present applicant has developed a method that effectively diffuses the light propagating within the optical conductor cable and makes it uniform over a wide area! fθ
Various proposals have been made regarding optical radiators that can be used to improve light transmission. The present invention was made as part of this effort, and basically consists of providing a large number of rod-shaped bodies with approximately triangular cross-sections in contact with the surface of a light guide and running parallel to the light guide. The light coming from the rod is radiated through the rod-shaped body.

FIG. 1 is an enlarged side sectional view for explaining one embodiment of the optical radiator according to the present invention, and FIG.
A cross-sectional view taken along the line A, and (B) a cross-sectional view taken along the line B-B of FIG.
Reference numeral 8 denotes a rod-shaped body having a substantially king-gonal cross-sectional shape, which is formed in an arc shape so that the surface in contact with the light guide 2 is in close contact with the light guide 2;
4a is a transparent or translucent container for sealing the rod-shaped body and the light guide; The upper plate 4b of the container 4 is an eaves plate, and the upper plate 4a is provided with a reflective mirror 5, and the eave plate 4b is provided with a reflective mirror 6 as required. As shown in the figure, a large number of rod-shaped bodies 3 are arranged around the light guide 2 in contact with the outer peripheral surface of the guide body 2 and in parallel with the guide body 2, so that light is transmitted through the light guide cable 1. The light passes through these rod-shaped bodies 8 in the guide body 2 and reaches the light guide 2.
radiated in the radial direction. Note that the reflective mirror 6 is not necessarily necessary, and in some cases, the reflective mirror 6
Alternatively, the light propagated within the light guide 2 may be emitted from the end face of the light guide 2. In the present invention, as shown in FIG. 2, the rod-shaped body 8 has a triangular cross-sectional shape with seven arcuate surfaces a on each side in contact with the light guide 2; The length of each side is 1, and the length of the rod-shaped body 8 is gradually increased along the direction of propagation of light. Therefore, the contact surface between the light guide 2 and the rod-shaped body 8 is gradually widened along the direction of propagation of light. , rod-shaped body 3. It's about average-I! (1 degree of light is emitted, i.e. light guide 2
Although the luminous flux density in the inner part gradually decreases along the traveling direction of the light, the contact area between the light guide and the rod-shaped body becomes wider, and from the head (ridgeline part) b of the rod-shaped body, the light flux density decreases gradually along the traveling direction of the light. - Light of illuminance is emitted. In addition, FIG. 2 (B) is a view of the rod-shaped body 3 shown in FIG. 1 viewed from the direction of the arrow ■, and FIG.
) is a sectional view taken along line A-A in the figure.

FIG. 8 is a cross-sectional view showing another embodiment of the closed container hand, and this embodiment has a large number of rods that engage with the inner wall surface of the closed container 4 with the head of the rod-shaped body, as shown in the figure. In this case, if the height h from the arc surface of the rod-shaped body 8 as the base is constant, after the rod-shaped body is arranged around the light guide, the ridgeline of the rod-shaped body By aligning the grooves of the container with the container and pushing the container in from one side, each rod will be precisely aligned in its desired position. After being aligned in this way, each rod can be glued to the light guide. By doing so, the positioning work of each rod-shaped body becomes easy. In addition, in Figure 3, (A) is a side view of line A-A 1 in (B), and (B)
The figure is a partial view of figure (A) seen from the ■ direction.

As is clear from the above description, according to the present invention, light,
fi k inside the conductor cable? The incoming light can be effectively and uniformly diffused and radiated using a simple configuration.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view for illustrating an embodiment of the optical radiator according to the present invention, FIG. 2 is a diagram showing an example of a rod-shaped body used in carrying out the present invention, and FIG. It is a figure which shows the other example of the airtight container used for implementation. DESCRIPTION OF SYMBOLS 1...Light conductor cable, 2...Light guide, 3...Bar-shaped body, 4...Airtight container, 5.6...Reflection mirror. Fig. 1 Fig. 2 +Al t4゜(B+ f817- Fig. 3 (pr +B1

Claims (1)

[Claims] (1) A cylindrical light guide, and a large number of rod-shaped transparent bodies arranged around the light guide in contact with the outer peripheral surface of the light guide and in parallel with the light guide. and a transparent or semi-transparent container that contacts the rod-shaped body and the light guide, and the light introduced into the light guide from one end of the light guide is transmitted to the rod-shaped body and the light guide. In a light radiator configured to emit light through a container to the outside of the container, the rod-shaped body has a triangular cross-sectional shape with an arcuate side in contact with the light guide, and the length of the side is equal to or smaller than the length of the side. An optical radiator characterized in that the optical radiator becomes longer in the direction of propagation in the optical guide. (2) The optical radiator according to claim (1), wherein the rod-shaped body has a constant height when the side is the base. (8) The optical radiator according to claim (1) or (2), wherein the container has a plurality of grooves along the ridgeline of the rod-shaped body on its inner wall.