JPH0430109A - Airtight repeating adapter - Google Patents

Abstract

PURPOSE:To omit an optical design process, and to prevent the delay of the time for delivery and the rise of cost by storing an optical fiber in the inside of a cylinder made of strong material, and injecting air-tightly adhesive into the contact surface of the cylinder and the optical fiber. CONSTITUTION:The optical fiber 6 of the same material and the same size as the optical fiber to be connected is used, and after it is inserted into the inside of the cylinder 5, and is fixed by the adhesive, an O-ring A4 is fitted on the outer circumference of the cylinder 4, and the cylinder 4 is fitted and stored in a hole formed at a housing 1. Light exiting from the end surface A of the cylinder 5 advances in the inside of the optical fiber 6 buried in the cylinder 5, and after it reaches the end surface B of the cylinder, the light is transmitted to an optical fiber stored in a ferrule. The pressure of gas in an airtight container 9 is sealed by the O-ring A4 at the contact surface of the inner surface of the housing 1 and the outer circumference of the cylinder 5. Besides the adhesive 7 is used both for fixing and sealing the inner surface of the cylinder 5 and the fiber 6. The contact surface of the housing 1 and the airtight container 9 is sealed by the O-ring B8.

Description

[Detailed description of the invention] [Industrial application field] The present invention is used for optical fiber cables for transmission.

This invention relates to an airtight relay adapter.

[Conventional technology]

FIG. 5 is a sectional view showing a conventional example of this type of airtight relay adapter, and FIG. 6 is a front view thereof.

In the figure, 1 is a housing, 2 is a sleeve, 11 is a lens spacer, 12 is a lens, 4 is an O-ring A, 13 is a set screw, and 8 is an O-ring B.

Insert the lens spacer 11 with the O-ring A4 attached to the inside of the housing 1 from both sides, then install the lens 12 inside the lens spacer 11, set the lens 12 at the predetermined position 1, and fix it with the setscrew 13. has been done. After the lens 12 is attached, the sleeve 2 is attached to the inside of the housing l from both sides.

The airtight relay adapter connects to the airtight container 9 via the O-ring B8.
It is attached with bolts 10.

The tip of the ferrule of the optical fiber connector is the sleeve, 2
passes through the inside of the lens 12 and comes into contact with the end surface A of the lens 12. Similarly, the tip of the ferrule inserted from the other end also contacts the end surface B of the lens 12. Light emitted from the end surface A of the lens 12 is collected by the lens 12, converged at the end surface B, and transmitted to the optical fiber housed in the ferrule.

The pressure of the gas inside the airtight container 9 is sealed by the O-ring A4 at the contact surfaces of the housing 1, the spacer 11, and the lens 12, and gas leakage is prevented.

Further, gas passing through the gap between the setscrews 13 fixing the lens 12 is similarly sealed by the O-ring A4 to prevent leakage.

The contact surface between the airtight container 9 and the housing 1 is sealed by an O-ring B8 to prevent gas leakage.

[Problem to be solved by the invention]

However, according to the conventional technology with the above-mentioned configuration, the length of the ferrule of the optical fiber connector is determined by the standard, and it is not possible to increase the length of the ferrule when the thickness of the airtight container increases. Therefore, it becomes necessary to change the length of the lens.

Furthermore, when the wavelength of the light source used changes, it becomes necessary to change the design of the lens length.

Based on the above, if there is a change in the design conditions of an airtight container or optical fiber connector, the optical design such as lens length and focal length will have to be changed, which will lead to delivery delays and increased costs. there were.

Another problem is that the field pattern characteristics of the optical fiber change when it passes through a lens.

Furthermore, since the lens is made of glass, there is a problem in that it is easily damaged.

In view of the above problems, the present invention provides a configuration that can accommodate various design conditions of airtight containers and optical fiber connectors without requiring optical design, eliminates the optical design process when changing design conditions, and reduces delivery delays and costs. The purpose is to prevent the rise.

Another purpose is to prevent changes in field pattern characteristics in the light transmission material and improve transmission performance.

Furthermore, it is an object of the present invention to obtain a light transmitting material having a structure that is difficult to break and to improve its durability.

[Means for Solving the Problems] In order to achieve the above object, the present invention uses, as an optical transmission material, the same optical fiber core as the optical fiber core wire housed in the ferrule to be connected, in accordance with changes in design conditions. Make it possible to wear it.

That is, the present invention incorporates a light transmitting material having a contact surface at both ends for contacting the ferrule tip of an optical fiber connector, and when installed in an airtight container, an airtight material that seals the pressure of gas inside the airtight container. In an airtight relay adapter having a function, a coated optical fiber is used as the optical transmission material, the coated optical fiber is housed inside a cylinder made of a strong material, and a contact surface between the cylinder and the coated optical fiber is placed. It is characterized by the adhesive being injected airtightly.

Furthermore, it is characterized in that the cylinder is formed by dividing it into two parts.

[For production]

With the above configuration, the present invention accommodates a coated optical fiber of the same material and the same shape as the coated optical fiber housed in the ferrule of the optical fiber connector inside the cylinder, and forms the contact surface between the two cylinders and the coated optical fiber. If the adhesive is injected airtightly, the optical transmission material can have the same characteristics as the optical fiber core housed in the ferrule.

Further, the optical fiber core wire after installation is protected by the cylinder.

Furthermore, if the cylinder is formed by dividing into two parts, processing becomes easy even if the outer diameter is small.

〔Example〕

Examples will be described below according to the drawings.

FIG. 1 is a side sectional view showing one embodiment of the present invention, and FIG. 2 is a front view thereof.

In the figure, 1 is a housing, 2 is a sleeve A, 3 is a sleeve B, 4 is an O-ring A, 5 is a cylinder, 6 is an optical fiber core, 7 is an adhesive, 8 is an O-ring B, 9 is an airtight container, 1
0 is installed with bolts.

The optical fiber core 6, which is a light transmission material, is made of the same material and has the same dimensions as the optical fiber core wire to be connected in this embodiment, and is inserted into the cylinder 5, fixed with adhesive 7, and then inserted into the cylinder 5. An O-ring A4 is attached to the outer periphery of the housing 1, and the O-ring A4 is attached to and housed in a hole provided in the housing 1. Furthermore, the sleeve A2 is also mounted inside the housing l.

Further, the sleeve B3 is attached to a hole provided on the opposite side of the housing 10.

The O-ring B8 is attached to an O-ring groove formed in the housing 1, and the housing 1 is attached to the airtight container 9 and fixed with bolts 10.

The ferrule tip of the optical fiber connector passes through the inside of the sleeve A2 and comes into contact with the end surface A of the cylinder 5 in which the optical fiber core 6 is embedded. Similarly, the tip of the ferrule inserted from the other end also contacts the end surface B of the cylinder 5.

The light emitted from the end surface A of the cylinder 5 travels inside the optical fiber core 6 embedded in the cylinder 5, and after reaching the end surface B of the cylinder 5, the light is transmitted to the optical fiber housed in the ferrule. . The pressure of the gas inside the airtight container 9 is
The contact surface between the inner surface of the cylinder 5 and the outer periphery of the cylinder 5 is sealed by an O-ring A4 to prevent gas leakage. Further, since the inner surface of the cylinder 5 and the fiber core wire 6 are fixed and sealed by the adhesive 7, leakage of gas is prevented. Further, the contact surface between the housing 1 and the airtight container 9 is sealed by an O-ring B8 to prevent gas leakage.

FIG. 3 is a sectional side view of a main part showing a second embodiment of the present invention, and FIG. 4 is a front view thereof.

In the figure, 5-1 is a cylinder A, 5-2 is a cylinder B, 16 is an optical fiber, 4 is an O-ring A, and 7 is an adhesive. The cylinder 5 is divided into two parts because it is difficult to process the cylinder 5.

An O-ring groove is machined on the outer periphery of the cylinder A3-1, and a stepped hole is machined on the inside of the cylinder.0 Cylinder A3-1 and cylinder 85-2
The centers of each stepped portion are aligned by fitting.

Holes (hole diameter and hole size) suitable for the optical fiber core 6 are formed on the center lines of the tips of the cylinders A and B, and holes as large as possible are formed in other parts.

The optical fiber core wire 6 is inserted into the cylinder A3-1, and the optical fiber core 6 is inserted into the cylinder A3-1.
1 and the gap between the optical fiber core 6 is filled with adhesive 7. Similarly, by filling the gap between the hole on the inner surface of the cylinder B5-2 and the optical fiber core with the adhesive 7, the optical fiber core 6, the cylinder A3-1, and the cylinder B5-2 are integrated, and fixation and sealing is possible. becomes. After integration, an O-ring A4 is attached to the outer periphery of the cylinder A3-1 and attached to the inner surface of the flange 1, thereby making it possible to maintain airtightness.

[Effects of the Invention] As described in detail above, according to the present invention, the optical fiber connector includes a built-in optical transmission material having contact surfaces at both ends for contacting the ferrule tip of the optical fiber connector, and when installed in an airtight container.
In the airtight relay adapter having an airtight function to seal the pressure of gas inside the airtight container, a coated optical fiber is used as the light transmission material, and the coated optical fiber is placed inside a cylinder made of a strong material. Adhesive is injected airtightly into the contact surface between the optical fiber core and the ferrule to be connected, so that the same optical fiber core as the one housed in the ferrule to be connected can be Can be attached as a transmission material.

This makes it possible to respond to various design conditions for airtight containers and optical fiber connectors without requiring optical design, and has the effect of eliminating the optical design process when changing design conditions and preventing delivery delays and cost increases. .

Furthermore, since the optical transmission material is an optical fiber core wire made of the same material and having the same outer diameter, there is no change in field pattern characteristics, and the transmission performance is improved.

Furthermore, since the optical fiber is protected by the cylinder, it is less likely to be damaged and has the effect of improving durability.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing the first embodiment of the present invention, FIG. 2 is a front view thereof, FIG. 3 is a side sectional view of main parts showing the second embodiment of the present invention, and FIG. 5 is a side sectional view showing a conventional example, and FIG. 6 is a front view of the same. l...Housing 2.3...Sleeve 6...Optical fiber core 5...Cylinder

Claims (1)

[Claims] 1. Contains an optical transmission material having contact surfaces at both ends for contacting the ferrule tip of an optical fiber connector, and when installed in an airtight container, seals the pressure of the gas inside the airtight container. In an airtight relay adapter having an airtight function, an optical fiber is used as the optical transmission material, the optical fiber is housed inside a cylinder made of a strong material, and the cylinder and the optical fiber are in contact with each other. An airtight relay adapter characterized by having adhesive injected into its surface. 2. The airtight relay adapter according to claim 1, wherein the airtight relay adapter is formed by dividing a cylinder into two parts.