JPH02721Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an optical fiber connection plug.

Optical fibers used in optical communications have cores made of optical glass or synthetic resin such as acrylic, each having a predetermined refractive index and different refractive indexes, as shown in Figure 4, for example. 1 and a cladding 2, and a coating layer 3 made of vinyl chloride or the like covering the outside thereof. When using this optical fiber for optical transmission,
Effectively transmit and receive optical signals by optically connecting the end of the optical fiber to a desired photoelectric element or connecting the ends of the optical fiber to each other using a plug, receptacle, or adapter for optical fiber connection. things are done.

However, this type of conventional optical fiber connection plug has a large number of components, which increases manufacturing costs, makes it extremely troublesome to attach the optical fiber end, and the optical fiber end easily comes off when tensile force is applied. There was a problem.

In view of the above problems, the present invention reduces the manufacturing cost by reducing the number of parts to one, makes it easy to attach the optical fiber end, and makes the optical fiber connection difficult for the optical fiber end to come off even when a tensile force is applied. The aim is to provide plugs for

A front half part having a center hole approximately equal to the outer diameter of the cladding of the signal transmission part of the optical fiber and having a fitting part at the front end which can be fitted with another member, and a center hole coaxial with the center hole. The upper part is divided into two with respect to the center of the center hole, and has an upper engaging part consisting of a protrusion or hole in a direction parallel to the radial direction of the center hole, and is cuttable. an upper half part integrally connected to the plug body through a thin walled part, and a lower engaging part comprising a hole or a protrusion capable of engaging with the upper engaging part in a direction parallel to the radial direction of the center hole; A lower half having a By engaging the two engaging portions, the upper and lower half portions are coupled and fixed, thereby sandwiching the end portion of the optical fiber.

Hereinafter, the present invention will be explained in detail based on an embodiment shown in FIGS. 1 and 2. Reference numeral 4 has a center hole 5 having the same diameter as the outer circumference of the clad 2 of the optical fiber, and has a receptacle on the front end surface. The front half is provided with a female fitting part (groove) 6 that can be fitted with a male fitting part of another member such as a casing or an adapter, and 7 is a central hole with a diameter slightly smaller than the outer circumference of the coating layer 3 of the optical fiber. 5 and a pair of engaging holes 9, 9 in a direction parallel to the radial direction of the center hole 8. and a lower half 13 having a pair of engaging claws 12, 12 in a direction parallel to the radial direction of the center hole 8. These are integrally molded by injection molding of synthetic resin to constitute the entire plug.
The outer wall 6 of the female fitting portion 6 has four corners cut out to provide appropriate flexibility, and an engaging protrusion 6b is provided on the inner surface of the outer wall 6a.

Since the optical fiber connection plug according to the present invention is constructed as described above, the tip portion of the optical fiber end with the coating layer 3 removed is inserted from the rear of the present plug into the center hole 5 through the center hole 8. At the same time, the portion of the coating layer 3 that is not to be removed is pushed into the center hole 8. Next, the upper half portion 11 is pushed down to cut the thin wall portion 10, and the engaging hole 9 is fitted into the engaging claw 11, so that the two are engaged (FIG. 2). Then,
Since the diameter of the center hole 8 is slightly smaller than the outer diameter of the coating layer 3 of the optical fiber, the portion of the coating layer 3 that is not removed is sandwiched between the upper and lower halves 11 and 13.
Therefore, the end of the optical fiber can be reliably held in the present plug with only two operations of pushing in and pushing down, making it extremely easy to attach the end of the optical fiber. Moreover, in this case, since the engagement action between the engagement hole 9 and the engagement claw 12 is quite strong, the clamping force by the upper and lower halves 11 and 13 can be set strong, and as a result, the end of the optical fiber is forced backward. Even if a tensile force is applied, the end of the optical fiber does not easily come off from the plug of the present invention. In addition, the plug of the present invention has only one component and the entire plug can be integrally molded by injection molding, so the manufacturing cost is reduced.

If the female fitting part 6 of the plug with the optical fiber end attached is fitted into the male fitting part 15 of the receptacle 14, for example, as shown in FIG. protrusion 1 provided on the outer surface of
5a engages with the protrusion 6b of the female fitting part 6 and cannot be removed. Therefore, the present plug is the receptacle 14.
The end face of the optical fiber end is placed coaxially close to the surface of the photoelectric element 16 such as a light receiving element mounted on the receptacle 14, and is optically connected.

FIG. 3 shows another embodiment, in which an engaging claw 12 is provided in the upper half 11 and an engaging hole 9 is provided in the lower half 13, and the engaging claw 1 is provided in the upper half 11.
2 is connected to the lower half part 13 via the thin part 10.

It goes without saying that the fitting portion of the plug of the present invention is formed in a male shape when the fitting portion of the receptacle or adapter is female.

As mentioned above, the optical fiber connection plug according to the present invention has important practical advantages in that it is easy to attach the optical fiber end, the optical fiber end does not come off even when a tensile force is applied, and the manufacturing cost is low. have.

[Brief explanation of the drawing]

1A, B and C are a left side view, a front view and a right side view of an embodiment of the optical fiber connection plug according to the present invention, and FIG. 2 is a cross section showing the above embodiment connected to a receptacle. FIG. 3 is a front view of another embodiment, and FIG. 4 is a perspective view of the end of the optical fiber. 4... First half, 5... Center hole, 6... Female fitting part, 7... Second half, 8... Center hole, 9... Engaging hole, 10... Thin wall part, 11... Top Half, 12...
Engagement claw, 13...lower half.

Claims (1)

[Scope of utility model registration request] A front half part having a center hole approximately equal to the outer diameter of the cladding of the signal transmission part of the optical fiber and having a fitting part at the front end that can be fitted with another member, and a center hole coaxial with the center hole. The upper part is divided into two with respect to the center of the center hole, and has an upper engaging part consisting of a protrusion or hole in a direction parallel to the radial direction of the center hole, and is cuttable. an upper half part integrally connected to the plug body through a thin walled part, and a lower engaging part comprising a hole or a protrusion capable of engaging with the upper engaging part in a direction parallel to the radial direction of the center hole; A lower half having a A plug for connecting an optical fiber, wherein the upper and lower halves are coupled and fixed by engaging both engaging portions, thereby sandwiching an end portion of the optical fiber.