JPS6336205A - Fixing plate for optical fiber - Google Patents

Abstract

PURPOSE:To improve the performance of an optical fiber encoder by fitting a fixing plate to the side of an optical fiber group sorting member body, engaging and fixing pairs of optical fibers with/on plural holes perforated on the fixing plate and cutting and trimming the end parts of these optical fibers. CONSTITUTION:A spacer 10 is fitted to the outer periphery of the optical fiber storing part body 8 for holding the optical fiber fixing plate 6 to store optical fiber groups 12a-12i in the body 8. The body 8 is coupled with a bush 16 consisting of an elastic body and an optical fiber cable 18 is stored in the bush 16. The optical fiber groups stored in the body 8 are respectively coated with a tensile force resisting material, e.g. a cabler 20, and the cabler 20 is locked by a cabler ring 22 and a cabler snap ring. Two pairs of long elliptical holes 26, 28, 30, 32 are formed symmetrically around the center part of the fixing plate 6, respective pairs of optical fibers 12a, 12b, 12e, 12f, 12g, 12i, 12c, 12d into the holes and stuck by adhesives 34 and then the end parts of the optical fiber groups 12a-12i are cut out and trimmed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an optical fiber fixing plate. In particular, the present invention relates to a structure for fixing the tips of a plurality of sets of optical fibers.

(Prior Art) A conventional structure for fixing the ends of a plurality of optical fibers will be described with reference to FIGS. 3 and 4. A circular through hole 4 for accommodating the optical fibers 2 (two sets in this example) to be used is provided in the optical fiber fixing metal B 3 connected to the optical fiber cable l, and after the optical fibers 2 are inserted into the through holes 4. The optical fiber is fixed in the through hole 4 by injecting and filling the adhesive 5 into the circular through hole 4 of the fixture 3 and drying the adhesive 5. After fixing, the end face of the optical fiber 2 is cut and processed so that the cut end face of the optical fiber 2 and the surface of the mounting bracket 3 are substantially on the same polished surface.

(Problems to be Solved by the Invention) However, in the above configuration, since a plurality of optical fibers 2 (in this example, two sets) are inserted into one circular through hole 4, the positioning of each optical fiber 2 is difficult. Moreover, since the through hole 4 is a round hole, there are problems such as setting the dimensional accuracy of this hole and strict operational control during insertion and inspection when inserting the optical fiber. Ta.

(Means for solving the problems, etc.) Therefore, in view of the above-mentioned problems, the present invention has made great efforts to overcome these problems.

An optical fiber fixing plate for storing and fixing the optical fiber IT is attached to the front of the optical fiber holding member, and a hole of the optimum shape for inserting and fixing multiple pairs of optical fibers is bored in this fixing plate, and the hole is inserted into the fixing plate. Pull out the optical fiber and insert it so that it does not fall out, inject adhesive into the gap between the optical fiber and the hole, dry it, and attach it to the fixing plate 1/! Provides a first-place structure.

The optical fibers are inserted and fixed into the holes of the fixing plate in pairs -1ij, and their tips are trimmed.

Further, the fixing plate is inserted into the spacer member by IK, and its outer peripheral surface is held between the spacer members. Before assembling both parts, it is possible to process the optical fiber insertion holes on the fixing plate, so it is easy to perform precision work on the insertion holes, and it is easy to make one optical fiber. The removal work to the fixing plate was carried out in 1
One thing you can do quickly.

(Embodiment) An embodiment of a plurality of optical fiber fixing plates according to the present invention will be described below. In FIG. 1, an optical fiber fixing plate 6
A spacer 10 is attached to the outer periphery of the optical fiber housing main body 8 that holds the optical fiber. Optical fiber groups 12a . . . 12i are housed inside the main body 8.

A bushing 16 made of an elastic body is connected to the main body 8, and an optical fiber cable 18 is housed inside the bushing 16. The optical fiber groups accommodated in the optical fiber housing main body 8 are each covered with a tensile strength member, for example, Kevlar 20,
This Kevlar member 20 is held in place by a Kevlar ring 22 and a Kevlar retaining ring 24 so as not to move. Figure 2 is the first
This is a side surface 1Δ when the figure is viewed in the direction of arrow A. The optical fiber fixing plate 6 according to the present invention is housed within the spacer 10. Two pairs of oblong holes 26 symmetrically centered around the center of the fixing plate 6.
28, 30.32 are drilled. These holes 26.28
, 30 and 32 have a pair of optical fibers j2a and 1, respectively.
2b, 12e, 12f.

12g, 124, 12c, and 12d are inserted, and after insertion, adhesive 34 is injected into these holes, and after drying,
The optical fiber groups 12a-12i are fixed in the holes 1126-32, and then the ends of the optical fiber groups 12a-12i are cut and trimmed.

The fixing plate 6 is fixed to the optical fiber housing main body 8 via a 1-Tm pair of retaining members 36 and 38. The optical fiber groups are used to process light of each phase, for example, A phase, W phase, B phase, and Z phase.

(Effects) The optical fiber group of the present invention is attached to each insertion and fixing hole drilled in a fixing plate, and this fixing plate is combined with the main body of the optical fiber storage part, and the optical fibers are aligned with M1. 47. A fixing plate that makes it easy to determine the hole position for fitting and fixing and to ensure dimensional accuracy, and that fixes the optical fiber group without shifting the position. ! The performance of the optical fiber encoder can be improved.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a part of an optical fiber housing incorporating a fixing plate according to the present invention in cross section. Figure 3 is a cross-sectional view of a conventional optical fiber storage body, and Figure 4 is a side view of Figure 3 viewed from the right direction when facing the figure. figure. 6...Fixing plate, 8...Optical fiber storage unit main body, lO
... Spacer, 12... Optical fiber group, 18...
Optical fiber cable, 26.28.30.32...Oval hole, 34...Adhesive

Claims (1)

[Scope of Claims] 1. A fixing plate is attached to the side surface of the main body of the optical fiber group storage member, a pair of optical fibers is inserted and fixed into each of the plurality of holes bored in the fixing plate, and the ends of these optical fibers are fixed. Optical fiber fixing plate made by cutting and trimming parts. 2. The optical fiber fixing plate according to claim 1, wherein a spacer is provided on the outer periphery of the fixing plate. 3. The optical fiber fixing plate according to claim 1, wherein the fixing plate has a plurality of oblong holes.