JPH01198711A - Joining structure for photoelectric element holder and optical fiber holder - Google Patents

Abstract

PURPOSE:To hold optical coupling which is superior dust-proofing and excellent for a long period by fitting the projection parts and recessed parts of the photoelectric element holder and optical fiber holder with each other, arranging and pressing doughnut-shaped packings against the fitted abutting surfaces, and optically coupling photoelectric elements and optical fibers individually with each other. CONSTITUTION:The photoelectric elements 4 are arranged at the bottom parts of the recessed parts of the photoelectric element holder 1, and the optical fibers 5 are arranged at the peak parts of the projection parts of the optical fiber holder 2. Then the projection parts are fitted in the recessed parts to couple the photoelectric elements 4 and optical fibers 5 optically with each other, the doughnut-shaped packings 3 made of urethane rubber are arranged on the fitted abutting surfaces of the projection parts and recessed parts, and both holders 1 and 2 are pressed against each other. When the holders 1 and 2 are joined together, the projection parts of the optical fiber 2 are fitted in the recessed parts of the photoelectric element holder 1 where the packings 3 are held, and both holders 1 and 2 are clamped by locking to join the both. Consequently, the press-contacting force between then packings 3 and holders 1 and 2 increases and further a defect in the plane accuracy of the holders 1 and 2 and a defect in press-contacting due to dynamic or thermal deformation are reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a joining structure of a photoelectric element holder and an optical fiber holder used in a pre-reception transmitter.

[Conventional technology]

When transmitting and receiving a large number of signals at the same time in optical communication, a plurality of photoelectric elements and optical fibers are each arranged in a line in one holder, and these two holders are arranged so that the above-mentioned photoelectric elements and optical fibers are arranged one-to-one. They are used by being placed opposite each other so that they are optically coupled.

However, there is a problem in that dust enters between the joint surfaces of the holder and adheres to the charging element and the light receiving and emitting surfaces of the optical fiber, reducing optical coupling.To solve this problem, conventional box 3.4 As shown in the figure, the photoelectric element holder 1
A method has been adopted in which the optical fiber holder 2 is pressed against the optical fiber holder 2 with a single piece of punch 23 having a hollowed-out optical coupling portion interposed therebetween to prevent dust from entering.

[Problems to be Solved by the Invention] However, when a single piece of packing as described above is used, it is difficult to press the entire surface of the packing evenly because the area of the packing is large, and it is difficult to press the entire surface of the packing evenly. There has been a problem in that voids are created in the packing due to mechanical action, and dust enters through these voids, reducing optical coupling.

[Means for Solving the Problems] The present invention has been made in view of the above situation, and an object thereof is to provide a bonding structure of a photoelectric element holder and an optical fiber holder that is excellent in dustproof property.

That is, the present invention provides a joint structure of a photoelectric element holder in which a plurality of photoelectric elements are arranged and an optical fiber holder in which a plurality of optical fibers are arranged, in which the photoelectric element arrangement parts are individually recessed, and the optical fiber arrangement parts are individually recessed. The photoelectric element holder and the optical fiber holder fit each convex part and concave part, respectively, or the photoelectric element holder and the optical fiber holder each have a convex part and a concave part respectively. The photoelectric element and the optical fiber are individually optically coupled by placing a doughnut-shaped packing on the mating surface of the fitting and press-fitting the same.

In the present invention, the photoelectric element and the optical fiber are arranged so that the light receiving and emitting surfaces at their tips are exposed flush with, for example, the top surface of the convex portion and the bottom surface of the concave portion, respectively, and the convex portion and the concave portion are fitted to form a photoelectric element. In addition to optically coupling the element and the optical fiber, a small donut-shaped packing is placed on the mating surfaces of the mating surfaces to seal the gap between the mating surfaces and prevent dust.

In the above, the photoelectric element holder may have a protruding portion where the photoelectric element is disposed, and the optical fiber holder may have a recessed portion where the optical fiber is disposed.

In the present invention, a donut-shaped packing with a hollow center is used, and the coupled light is transmitted and received through the hollowed out part of the packing.

(Function) In the present invention, since the donut-shaped small gaskets are individually arranged around the optical coupling part, the contact area between the gaskets and the holder is small, and as a result, the pressure contact force between the gaskets and the holder increases, and furthermore, the holder Pressure welding defects caused by poor planar accuracy or mechanical or thermal deformation are reduced.

[Example〕 The present invention will be explained in detail below with reference to the drawings.

Embodiment 1 FIG. 1 is a side cross-sectional explanatory view showing an embodiment of the joining structure of the present invention.

In the figure, 1 is a photoelectric element holder, 2 is an optical fiber holder, and 3 is a gasket.

The photoelectric element 4 is placed at the bottom of the concave portion of the photoelectric element holder 1, and the optical fiber 5 is placed at the top of the convex portion of the optical fiber holder 2, and the convex portion is fitted into the concave portion. Then, the photoelectric element 4 and the optical fiber 5 are optically coupled, and a donut-shaped packing 3 made of urethane rubber is placed on the abutting surfaces of the fitting portions of the convex portion and the concave portion, and both holders 1.2 are pressed together. .

The inside of the recessed portion of the photoelectric element holder 1 is tapered so that the gasket 3 is held within the photoelectric element holder 1. In addition, when joining the holders 1 and 2, the convex part of the optical fiber holder 2 is fitted into the concave part of the photoelectric element holder 1 in which the gasket 3 is held, and both holders 1 and 2 are joined together.
, 2 are fastened and joined using a locking method or the like.

Embodiment 2 FIG. 2 is a side sectional explanatory view showing another embodiment of the joining structure, in which the diameters of the concave portion of the photoelectric element holder l and the convex portion of the optical fiber holder 2 are enlarged, and a packing 13 with a large diameter is interposed. The space of the optical coupling part is widened.

A dustproof test was conducted using the two types of joints having the joint structure of the present invention described above and the conventional joint structure shown in FIG. 3-4.

The test method is to wire two arbitrary optical fibers of the joined body into one loop wiring in advance, and then wire the joined body with well-dried 0,
Place the airtight case in an airtight case filled with 3 to 1.0- alumina powder, and shake the airtight case at 1116cm, frequency 100).
The bonded body was then vibrated for 168 hours at a temperature of 168 H.The above bonded body was then taken out from the airtight case, and light was input and output between an optical fiber wired in a loop and a photoelectric element facing the optical fiber, and the amount of light lost was measured. The results are shown in Table 1.

Table 1 n=4 As is clear from Table 1, the junction structure of the present invention has an extremely small amount of light loss compared to the conventional one.

〔effect〕

As described above, the bonding structure of the present invention has excellent dustproof properties, maintains good optical coupling properties over a long period of time, and exhibits remarkable industrial effects.

[Brief explanation of the drawing]

1.2 is a side cross-sectional explanatory view showing an embodiment of the joint structure of a charging element holder and an optical fiber holder of the present invention, FIG. 3 is an external view of a conventional joint structure, and FIG. 4 is a conventional joint structure. It is a side cross-sectional explanatory view of a structure. 1... Photoelectric element holder, 2... Optical fiber holder, 3, 13.23... Pankin, 4... Photoelectric element, 5... Optical fiber.

Claims (1)

[Claims] In a joint structure of a photoelectric element holder in which a plurality of photoelectric elements are arranged and an optical fiber holder in which a plurality of optical fibers are arranged, the photoelectric element arrangement parts are individually recessed, and the optical fiber arrangement parts are individually protruded, Or the photoelectric element arrangement portions are individually protruded, the optical fiber arrangement portions are individually recessed,
The photoelectric element holder and the optical fiber holder are pressed into contact with each other by fitting their respective convex portions and concave portions, and disposing a donut-shaped packing on the abutting surfaces of the fitting, so that the photoelectric element and the optical fiber holder are pressed together. A bonding structure of a photoelectric element holder and an optical fiber holder, characterized in that they are individually optically coupled.