JPH041522Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a spectral light guide having an objective portion in which a large number of optical fibers are arranged in parallel with each other with spacers in between.

[Prior Art] For example, there is a light guide in which an objective part is provided at one end of a plurality of light guides formed of the same number of optical fibers, and an optical connector is provided at the other end of each light guide. be. FIG. 3 is a partially cutaway plan view of a spectroscopic light guide used for example in spectroscopic analysis, and shows 10a, 10
b is a large number of optical fibers constituting the light guides 1a and 1b. The light guides 1a and 1b are formed by a main body 21 and a lid pair 22 at one end,
Groove 23 in which optical fibers 10a and 10b are placed
An objective device 2 is provided. As shown in FIG. 4, which shows the objective surface of the objective device 2, a short and small metal rod-shaped spacer 24 is interposed between the light guides 1a and 1b and fixed with adhesive. Reference numerals 3, 4a and 4b designate protective tubes which are made of, for example, flexible metal tubes covered with plastic, through which the light guides 1a and 1b are inserted. Reference numeral 5 denotes a branching portion where the light guides 1a and 1b are branched. Connectors 6a and 6b are attached to the light guides 1a and 1b, respectively.

[Problems to be solved by the invention] By the way, a spacer 24 is interposed between the light guides 1a and 1b at the tip of the objective device 2. However, since the optical fibers 10a and 10b are thin and the spacer 24 is small in shape, the spacer 24, which was supposed to be accurately placed when manufacturing the objective device 2, may be misplaced due to a change in the placement. Moreover, the optical fibers 10a, 10b
Because the mechanical properties of the optical fibers 10a, 10b and the spacer 24 are different, the alignment of the optical fibers or spacers is disturbed before the adhesive is applied and the spacer 24 is fixed. In this case, when the objective device 2 is moved in the short axis direction (vertical direction with respect to the plane of the paper), the light that should be incident on each light guide does not enter the light guide, and unnecessary light enters the connectors 6a and 6b. The desired light cannot be transmitted.

Furthermore, it is not easy to quickly manufacture an objective part of a spectroscopic light guide with high quality and with good yield.

[Means for Solving the Problems] The spectroscopic light guide of the present invention is designed to avoid the above-mentioned problems when providing an objective section at the end of an optical fiber. A plurality of light guides in which optical fibers are arranged in parallel in one stage or in multiple stages are arranged in parallel through a spacer made of a group of linear bodies having the same diameter as the optical fibers to form an objective part, and at the other end, An optical connection portion is provided at the end of each light guide.

[Embodiment] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. Codes that are the same as the preceding codes are the same or have the same purpose.

FIG. 1 is a partially cutaway plan view of an embodiment of the present invention. In the figure, 7 is a light guide member, and optical fibers 10a and 10 are connected to each other with a dummy unit 8 in between.
Light guides 1a and 1b consisting of b are arranged,
After being fixed with adhesive, the main body 91 and the main body 92
It is incorporated into an objective device 9 consisting of.

3, 4a, and 4b are all protective tubes, 5 is a branch portion, and 6a, 6b are connectors, which have the same configuration as the above-mentioned structure, and detailed description thereof will be omitted.

FIG. 2 is an explanatory view of the end face of the objective device 9,
A set of light guide members 7 formed by stacking optical fibers 10a and 10b in two layers is shown incorporated therein, and a number of short optical fibers 80 made of the same material as 10b are incorporated.
0b, and the optical fibers 10a, 10
The light guide member 7 is fixed together with the light guide member b using an adhesive.

The dummy unit 8 has optical fibers 10a, 10
It is preferable to use the same size and made of the same material as b, but if the quality is uniform and the outside diameter is the same, and there is no change in the outside diameter in the axial direction, use a similar material. I can do it. When manufacturing the light guide member 7, the optical fibers 10a, 10b and the optical fiber 80 for the dummy unit are lined up in a long order on a flat plate with a shallow groove, and an adhesive is applied. Let it harden. Thereafter, if the optical fiber is removed from the flat plate and the excess length is cut, leaving a length necessary as a spacer for the dummy unit 8, it is convenient to easily obtain a high-quality product at a high yield.

In addition, although the above description has shown that the optical fibers 10a and 10b are stacked in two layers, it may be one layer or three or more layers. Further, although the case in which one set of light guide members is used has been described, two or more sets of similarly formed light guide members 7 may be stacked in the groove 93. Furthermore, the number of light guides and spacers can also be increased.

[Effects] As mentioned above, the spectroscopic light guide of the present invention has the following effects:
A light guide member configured by arranging optical fibers in parallel is installed in the objective device via a dummy unit formed using a linear body such as an optical fiber having the same outer diameter as the light guide. The dummy unit is made of the same optical fiber as the light guide or a similar material and is arranged in parallel, and unlike the conventional method, it does not use other materials that are difficult to fit into the spacer, so it is especially useful when stacking optical fibers in two or more layers. Stable arrangement like stacked bales. Therefore, by determining the number of optical fibers, the cross-sectional area and positional relationship of the light guide and spacer can be determined with high precision, allowing for high-quality optical transmission. In addition, parts can be manufactured easily, with high yields, and quickly.
There are many advantages.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view of an embodiment of the present invention.
Fig. 2 is an explanatory diagram of the objective plane of the objective device of the present invention, Fig. 3 is an explanatory diagram of a conventional spectroscopic light guide, and Fig. 4 is an explanatory diagram of the objective plane of the objective device of the present invention.
The figure is an explanatory diagram of the objective surface of a conventional objective device. In the figure, 1a and 1b are light guides, 10
Numerals a and 10b are optical fibers, 7 is a light guide member, 8 is a dummy unit, and 9 is an objective portion.

Claims (1)

[Claims for Utility Model Registration] (1) At one end, a plurality of light guides in which a plurality of optical fibers are arranged in parallel in one stage or in multiple stages are spaced by a group of linear bodies having the same diameter as the optical fibers. 1. A spectroscopic light guide characterized in that objective parts are formed by being arranged in parallel through the light guides, and an optical connection part is provided at the other end of each light guide. (2) The spectroscopic light guide according to claim 1, wherein the filament of the spacer is a dummy glass fiber.