JPH0440174Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a ferrule for an optical fiber connector.

[Problems to be solved by conventional techniques and ideas]

As an optical fiber connector, for example, a pair of optical fiber ferrules that cover the outer periphery of the optical fiber are inserted closely from both sides of a support sleeve, the ferrule end faces are connected, and the covering and support sleeve are fixed with screws, etc. Conventionally, the ferrule used in this type of connector has a ferrule main body with a hole for passing the optical fiber through the main body. .

Naturally, with such a ferrule, only one optical fiber can be connected. Considering this current situation, recently, two optical fibers are connected at equal intervals from the center of the ferrule main body 5 as shown in FIG. Ferrule 17 provided with fiber insertion holes 16a and 16b
is used. When such a ferrule is used, for example, transmitting and receiving optical fibers can be connected at the same time, allowing efficient optical fiber connection.

However, the connection using such a ferrule has the disadvantage that it is difficult to distinguish between the two optical fibers. That is, one for receiving,
When the other is used for transmission, since the left and right sides are symmetrical, there is a problem in that it is difficult to determine which one is for reception and which one is for transmission.

The present invention is a ferrule for an optical fiber connector that can connect two optical fibers at the same time.It allows for the identification of each optical fiber at a glance, and also allows easy positioning of the ends of the optical fibers. The purpose of this invention is to provide a ferrule that makes it possible to connect.

[Means for solving problems]

The ferrule of this invention solves the above problems,
A ferrule used for optical fiber connectors, which has two insertion holes for inserting optical fibers along the longitudinal direction of the cylindrical ferrule body, and one optical fiber insertion hole is located at the center of the ferrule body. However, the other location is located at a position offset from the center.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an embodiment of the ferrule of the present invention, and numeral 1 indicates the ferrule.

The ferrule 1 has a cylindrical ferrule main body 2 made of ceramics or the like, and has two insertion holes 3a and 3b along the longitudinal direction thereof, through which optical fibers are inserted. The ferrule main body 2 has a cylindrical shape because the cylindrical shape is the easiest to manufacture, resulting in lower costs, and also because the center position of the insertion hole can be easily determined. by.

One of the insertion holes 3 a is provided at the center of the ferrule body 2 , and the other insertion hole 3 b is provided at a position offset from the center of the ferrule body 2 . The distance from the center of the insertion hole 3b varies somewhat depending on the size of the ferrule main body 2, etc., but a suitable distance is about 0.5 to 1 mm. Since the ferrule of the present invention is provided with an insertion hole as described above, it is possible to specify the optical fiber to be inserted through the insertion hole, and it is possible to connect the fiber without making a mistake during work.

An example in which the ferrule 1 of the present invention configured as described above is used in a connector will be described below.

FIG. 3 shows an optical fiber connector 4 using the ferrule of the present invention. The fiber optic connector 4 has a support 6 having a guiding space 5.
and two optical fibers 7a, 7b and the ferrule 1 of the present invention covering each optical fiber 7a, 7b.
a pair of optical fiber connection parts 8, 8 consisting of;
A pair of optical fiber connecting portions 8, 8 with opposing forces applied so that the respective end surfaces 9, 9 of each optical fiber connecting portion 8, 8 are brought into pressure contact inside the guide space 5,
8 and means for fixing the support body 6.

The fixing means include a screw 10 provided on the outer periphery of the support 6, and a socket 12 slidably and rotatably provided on the outer periphery of each optical fiber connecting portion 8, 8, and having a screw 11 provided on the inner peripheral surface. ,12
It consists of

The support body 6 has a cylindrical shape with a protrusion 13 provided along the outer peripheral surface at the center in the longitudinal direction, and a cylindrical guide space 5 is bored in the center.

The optical fiber connecting parts 8, 8 each have two optical fibers 7a, 7b inserted and fixed into the insertion holes 3a, 3b of the ferrules 1, 1 of the present invention. When inserted into
The outer surface of each ferrule 1, 1 is configured to be closely fitted to the outer inner circumferential wall surface 14 of the support body 6.

When using the connector 4 configured as described above, the optical fiber connecting portions 8, 8 are inserted from the left and right entrances of the guide space 5, respectively, and one of the connecting portions 8 is rotated to avoid deviation from the center. Align the optical fibers 7b and 7b that are in the same position, and then tighten the screw 1 of the sockets 12 and 12.
1 and 11 are screwed onto the screws 10 and 10 of the support body 6, the respective end surfaces 9 and 9 of each optical fiber connecting portion 8 and 8 are brought into pressure contact and each optical fiber 7a and 7b can be connected.

[Effect of idea]

As explained above, the ferrule of the present invention is a ferrule used in an optical fiber connector, and has two insertion holes along the longitudinal direction of the cylindrical ferrule body, through which the optical fibers are inserted. The insertion hole is located at the center of the ferrule body, and the other hole is located at a position offset from the center, so the two fibers to be inserted can be clearly distinguished, allowing for efficient and accurate fiber connection work. It is something that can be done.

Furthermore, since one of the insertion holes is located at the center of the ferrule, the end surfaces of the two fibers can be easily brought into contact with each other by simply aligning the other insertion hole that is offset from the center.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the ferrule of the present invention, FIG. 2 is a longitudinal sectional view taken along the line of FIG.
FIG. 3 is a longitudinal sectional view showing an example of an optical fiber connector using the fiber of the present invention, and FIG. 4 is a longitudinal sectional view showing a conventional two-hole ferrule. 1...Ferrule, 2...Ferrule main body, 3
a, 3b...Insertion hole, 4...Optical fiber connector, 7a, 7b...Optical fiber.

Claims (1)

[Scope of utility model registration request] A ferrule used for optical fiber connectors, which has two insertion holes for inserting optical fibers along the longitudinal direction of the cylindrical ferrule body, and one optical fiber insertion hole is located at the center of the ferrule body. A ferrule for an optical fiber connector is characterized in that the other ferrule is provided at a position offset from the center.