JPH0521046Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> This invention relates to an adapter for optical communication that is attached and fixed to the end of an optical fiber.

<Summary of the invention> The optical communication adapter of this invention is formed into a housing shape by fitting two cases together. A fiber insertion hole is formed between the surfaces facing the presser foot, and a fiber holder equipped with a spring piece is disposed in this insertion hole.

<Background of the invention> A conventional optical communication adapter has a structure in which a light emitting diode and a photodiode are housed inside, and a connector insertion hole is provided in a side wall at a position corresponding to each of these elements. On the other hand, the cut end surface of the optical fiber is polished, and a special connector that fits into the connector insertion hole is attached to the end of the optical fiber. When attaching the adapter to this optical fiber, when the connector is inserted into the connector insertion hole, the end face of the optical fiber comes into surface contact with the light emitting diode or photodiode.

However, with this mounting structure, it is necessary to polish the end face of the optical fiber and attach a connector to the end of the optical fiber, resulting in high costs. Therefore, there is a problem that it is not possible to respond quickly.

To solve this problem, the applicant previously
An optical communication adapter 8 having the structure shown in the figure was proposed.
In the adapter 8 shown in the figure, a holding base 83 having a groove 84 formed on the lower surface is attached onto a terminal block 81 having a groove 82 formed on the upper surface, and the end of the optical fiber 9 is attached between both grooves 82 and 84. An insertion hole 85 is formed for inserting the. According to this configuration, the optical fiber 9
It has the advantage that it can be inserted into the fiber insertion hole 85 and fixed by simply cutting the end face of the fiber without using any parts such as a connector.

However, when connecting small parts of this type, one must grasp the adapter 8 with one hand, insert the optical fiber 9 with the other hand, and insert the screw 8 of the presser stand 83.
Since it is necessary to perform a screw-turning operation on the optical fiber 6, there is a disadvantage that the optical fiber is misaligned when the screw is fixed, making it difficult to bring the end face of the optical fiber into close contact with the surface of the optical element.

<Purpose of the invention> This invention is a new optical communication device that can easily connect optical fibers and completely prevent misalignment by devising the overall assembly structure and providing a simple configuration for the fiber insertion hole. The purpose is to provide an adapter.

<Structure and effects of the invention> The optical communication adapter according to the invention is formed into a housing shape by fitting and tightening two cases, and the supporting position of the optical element of one case and the side wall of the case are formed into a housing shape. A receiving seat for the optical fiber provided between the receiving seat and a window hole opened in a position facing the receiving seat in the other case, and a window hole that is fitted into the window hole and connected to the receiving seat by tightening between the cases. a fiber presser for fixing the optical fiber therebetween; a fiber insertion hole opened in the side wall of the case formed between the contact surfaces of the receiving seat and the fiber presser; A fiber holder for temporarily fixing the optical fiber is provided with a spring piece that applies a spring force to the optical fiber.

According to this invention, if the end of the optical fiber is cut and then immediately inserted into the adapter,
The optical fiber penetrates against the elasticity of the spring piece in the fiber holder, and the cut end surface comes into close contact with the optical element, and this close contact is maintained in a temporarily fixed state, so the case can be tightened in this state. By fixing it, the optical fiber is completely fixed by the presser stand, allowing quick work on site. Further, since polishing of the end face of the optical fiber and attachment of a connector are not necessary, costs are also reduced. In addition, the fiber holder uses spring force to prevent the optical fiber from moving back and forth, maintains its close contact with the optical element, and prevents the optical fiber from shifting, improving the accuracy of the position of the optical element and optical fiber in close contact. It has many practical effects.

<Description of Embodiment> FIGS. 1 to 4 show an optical communication adapter 1 according to an embodiment of this invention.

The adapter 1 is formed into a housing shape by fitting upper and lower cases 1a and 1b made of ABS or other tough synthetic resin. Upper and lower cases 1a, 1
b is provided with side walls that abut each other on the rear side and both sides thereof, and on the bottom surface of the lower case 1a is a mounting seat 11 on which a wiring board 5 is attached, and behind it a light emitting diode 3 and a photodiode 4 are mounted. A presser piece 13 is provided on the bottom surface of the upper case 1b to press and support the light emitting diode 3 and the photodiode 4 between the upper case 1b and the seat 12. Upper and lower cases 1
Screw holes 14 for inserting screws for integrally joining the upper and lower cases 1a and 1b are provided on both sides of the mounting seat 11 in the upper and lower cases 1a and 1b. The inside and outside are covered with nickel metal.

At the rear of the bottom of the lower case 1a are catch seats 12 on both sides.
An optical fiber seat 15 whose upper surface is substantially aligned with the opening surface of the case is integrally protruded between and the rear side wall. Further, a window hole 16 with a support flange 10 formed on the periphery of the hole is provided at a position facing the seat 15 of the upper case 1b, and the fiber presser 1c is fitted into this window hole 16, and the seat is seated. It is placed in opposition to 15.

On the upper surface of this catch seat 15 and the lower surfaces of the upper case 1b and the presser foot 1c opposing thereto, grooves 17 are formed, one end of which faces the light emitting diode 3 and the photodiode 4, and the other end of which communicates with the rear of the case. A fiber insertion hole 18 is formed between the upper and lower grooves 17, 17, and a fiber holder for temporarily fixing the optical fiber is provided in each fiber insertion hole 18 in the vicinity of the light emitting diode 3 and photodiode 4. 2 are arranged.

As shown in FIGS. 5 and 6, the fiber holder 2 in the illustrated example is a split cylinder 21 having longitudinal grooves 23 formed by bending a metal plate. It is formed to have an inner diameter that allows the optical fiber 7 to be inserted therethrough, and is fixed to an engaging portion 19 in which the diameter of the vertical groove 17 in the fiber insertion hole 18 is enlarged. Two spring pieces 22 are formed on the opposing cylinder wall parts of the split cylinder body 21, and are cut along the cylinder axis direction from one cylinder end and are cut inwardly. When the split tube body 21 is positioned on the element side and fixed in the fiber insertion hole 18 and the optical fiber 7 is passed through the split tube body 21, each spring piece 22 is inserted into the optical fiber 7.
It is to suppress and hold the government from both sides.

However, when assembling the adapter 1 according to this invention, the wiring board 5 to which the plug 6, light emitting diode 3, and photodiode 4 are connected is fixed in advance to the mounting seat 11 of the lower case 1a with screws, and the plug 6 is attached to the front surface of the case 1a. After placing the light emitting diode 3 and photodiode 4 on the seat 11 and the fiber holder 2 on the engagement part 19 in the opening, the upper case 1b is fitted onto the lower case 1a, and the wiring board Both cases 1a and 1b are connected and fixed by inserting screws into the screw holes 14 on both sides of case 5. In addition, the presser foot 1c is fitted into the window hole 16 of the upper case 1b so as to face the seat 15, and the fiber insertion holes 1 on both sides are
Tightening screws are inserted into the screw holes 20, 20 provided on the outside of the parts 8, 18 to temporarily tighten them. At this time, a slight gap is created at the rear of each of the upper and lower cases 1a, 1b due to the elasticity of the synthetic resin material, opening the grooves 17, 17 that constitute the fiber insertion hole 18, and making it easier to insert the optical fiber 7. Eggplant. When inserting the optical fiber 7 into each fiber insertion hole 18 in the open state, each optical fiber 7 is inserted into the fiber insertion hole 18.
The spring pieces 22 are pushed open to enter the holder 2 arranged and fixed therein, and each cut end surface 7 is
1 is a light emitting diode 3 and a photodiode 4
It stops when it comes in close contact with. In this state, the spring pieces 2 on both sides
2 aligns the axis of each optical fiber 7 with the center of the optical element, and maintains a close contact state by preventing the optical fiber from retreating by a spring force in the direction of the hole diameter.
Next, tighten the temporarily tightened screws and press the presser foot 1c.
By completely fixing the optical fibers 7, both the optical fibers 7 are gripped and fixed between the concave grooves of the seat 15 and the presser foot 1c. In this case, there is no local stress concentration of the gripping force on the optical fiber 7, and a sufficient electromagnetic shielding effect can be obtained.

According to the above embodiment, the cut end of the optical fiber 7 can be directly inserted into the fiber insertion hole 18 of the adapter 1 and integrally connected to the adapter 1, so the number of parts is reduced compared to the conventional structure in which a special connector is provided. This simplifies the structure, which saves labor in assembly work, and makes it easier to deal with disconnections on site. Moreover, when the optical fiber 7 is inserted and its cut end surface comes into close contact with the optical element, the holder 2 disposed in the fiber insertion hole 18
At this point, a temporary fixed state is achieved in which the close contact position and the close contact state are maintained, and there is no positional shift of the optical fiber during assembly and temporary fixation.The structure is simple and the practical effects are remarkable.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an optical communication adapter according to an embodiment of the invention, Fig. 2 is a sectional view taken along the line of Fig. 1, Fig. 3 is a sectional view taken along the line of Fig. 2, and Fig. 4 is a sectional view taken along the line of Fig. 2. The figure is a sectional view taken along the line of Fig. 2 and Fig. 5.
The figure is a side view of the fiber holder, FIG. 6 is a sectional view taken along the line of FIG. 5, and FIG. 7 is a perspective view of the conventional example. 1...Adapter, 1a...Lower case, 1b...
Upper case, 1c...Press base, 15...Catch, 16
... window hole, 18 ... optical fiber insertion hole, 2 ... fiber holder, 22 ... spring piece, 7 ... optical fiber.

Claims (1)

[Scope of Claim for Utility Model Registration] An optical communication adapter that is formed into a housing shape by fitting and tightening two cases, the adapter being formed between the supporting position of the optical element of one case and the side wall of the case. A receiving seat for the optical fiber provided therein, a window hole opened at a position facing the receiving seat in the other case, and an optical fiber that is fitted in the window hole and tightened between the cases and the receiving seat. a fiber presser for fixing the fiber presser; a fiber insertion hole that opens in the case side wall and is formed between the contact surfaces of the receiver and the fiber presser; and a fiber insertion hole that is arranged in the fiber insertion hole and that applies a spring force inward An optical communication adapter comprising a fiber holder for temporarily fixing an optical fiber, which is provided with a spring piece to act on the fiber holder.