JPH042923B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to a method for introducing light transmitted through multiple small diameter optical fibers into a single relatively large diameter light guide rod, and vice versa. The present invention relates to a connecting device between a light guide rod and an optical fiber, which is suitable for use in branching light transmitted through a single light guide rod into a plurality of optical fibers.

Prior Art The present applicant has previously proposed various methods for focusing sunlight by a lens and introducing it into a light guide, and transmitting it to any desired location through the light guide for illumination or other uses. One of them uses a large number of lenses with a diameter of about 4 cm, and the sunlight focused by each lens is introduced into an optical fiber whose light-receiving end is placed at the focal position of each lens. There is a system in which the light from a large number of optical fibers is collectively introduced into a single light guide rod and transmitted to any desired location through the light guide rod. However, in this case, there was no suitable means for connecting a large number of optical fibers to a single light guide rod, which was very inconvenient.

Purpose The present invention was made in view of the above-mentioned circumstances, and in particular, it is an object of the present invention to provide a connecting tool that can efficiently connect a large number of optical fibers to a single optical conductor rod. It has been done.

The figure is a sectional view for explaining one embodiment of the present invention, in which 1 is an optical fiber, 2 is a core part 2a
and a cladding layer 2b; 3 is a protective tube of the light guide rod 2; 10 is a connector according to the present invention; Sunlight, which is arranged and focused by each lens, is introduced and transmitted through the optical fiber.
The sunlight transmitted through the optical fiber 1 in this manner is transmitted to the light guide rod 2 via the connector 10, and transmitted through the light guide rod 2 to any desired location for illumination or other purposes. Ru.
The connecting device 10 is for connecting a large number of optical fibers 1 and a single optical conductor rod 2, and the connecting device 10 has an outer circumference having a screw 11a that is screwed into the inner circumferential surface of the protective tube 3. a surface 11, an extension 12 extending into the gap between the light guide rod 2 and the protective tube 3, a shoulder 13 that abuts the cladding layer 2b on the inside of the extension 12, and an identical section halfway from the shoulder. It is configured as a tubular body having an inner circumferential surface 14 consisting of a diameter portion 14a and a tapered widening portion 14b following the diameter portion 14a. When making a connection, first, the connector 10 is screwed into the protective tube 3 to form the state shown in the figure, and then the optical fiber 1 with the cladding layer cut off at the end is successively pushed into the connector 10, but the inner periphery of the connector 10 Since the surface 14b is formed in a tapered shape, the optical fiber can be pushed in even if the cladding layer of the optical fiber is not cut in this portion, and the maximum amount of the optical fiber can be pushed in. After a large number of optical fibers are pushed into the connector 10 in this manner, holes 1 are inserted into the optical fiber portion from above or in the side wall of the connector 10.
If adhesive is injected through 5, or if a gel adhesive that becomes adhesive after a predetermined period of time has passed after the connector is attached, the bond between each optical fiber and between the optical fiber and the connector can be firmly established. The light from the optical fiber can be efficiently introduced into the light guide rod. In the above explanation, we have explained the case where light from multiple optical fibers is transmitted to a single light guide rod, but conversely, the case where light from a single light guide rod is transmitted to multiple optical fibers is explained. It is also possible to use the branching optical fibers for transmission. In this way, when used for branching, various combinations of branching optical fibers with different diameters may be used.

Effects As is clear from the above description, according to the present invention, a large number of optical fibers and a single optical conductor rod can be effectively connected with a simple and inexpensive configuration.

[Brief explanation of drawings]

The figure is a side sectional view for explaining one embodiment of the present invention. 1... Optical fiber, 2... Light guide rod, 3
...Protection tube, 10...Connection equipment.

Claims (1)

[Claims] 1. A connecting device for connecting a relatively large diameter optical fiber having a core inside and a cladding layer on the outer periphery and a large number of small diameter optical fibers, the connecting device having a core on the outside of the optical fiber rod. an outer circumferential wall having a threaded portion threaded into the inner circumferential surface of the protective tube disposed at a predetermined distance from the light guide rod; an extension extending within the spacing; A tubular body having a shoulder portion that contacts the layer, an inner circumferential wall into which a large number of small diameter optical fibers extending from the shoulder portion are pushed, and an adhesive injection hole that communicates the inner circumferential wall and the outer circumferential wall. A connecting device for connecting a light guide rod and an optical fiber, characterized in that the inner diameter of the tubular body is the same from the shoulder portion to a midway point, and then tapers to become larger.