JPH0583711U - Multi-fiber optical connector - Google Patents

Abstract

(57) [Summary] [Construction] Ferrules 1 and 1 attached to the end portions of optical fiber core wires 6 to be connected with optical fibers 6a exposed for a predetermined length, and small diameter portions 7a at both ends are predetermined. It was connected by the guide pin 7 formed in length. [Effect] By forming the small-diameter portions 7a of a predetermined length at both ends of the guide pin 7 within a range in which the contact accuracy of the joining surfaces of the ferrules 1 and 1 can be secured, the guide pin 7 or the ferrule 1 is perforated. It is possible to prevent a decrease in the adhesion accuracy on the joint surface due to the bending of the provided guide pin fitting hole 4, and it is possible to extremely reduce the variation in the optical transmission loss when the ferrules 1 and 1 are attached and detached. Also, the guide pin 7
Since the resistance when fitting the ferrules 1 into the guide pin fitting holes 4 formed in the ferrule 1 is small, the ferrules 1 and 1 can be connected very easily.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a multi-fiber optical connector.

[0002]

[Prior Art]

 As shown in FIG. 4, the conventional multi-fiber optical connector has an optical fiber insertion hole 21 and an optical fiber core wire insertion hole 22 which are bored in the shaft center, and guide pin fitting holes 23, 23 are bored on both sides thereof. The ferrules 20 made of plastic or the like are attached to the end portions of the optical fiber core wires 24 to be connected with the optical fibers 24a exposed for a predetermined length, and the optical fiber exposed joint surface is polished into a mirror surface. The guide pins 25 are fitted in the guide pin fitting holes 23 formed opposite to each other, and the joining surfaces of the mirror-finished ferrules 20, 20 are closely contacted and connected.

[0003]

[Problems to be solved by the device]

 However, in the conventional multi-fiber optical connector configured as described above, when the guide pin fitting hole 23 formed in the ferrule 20 or the guide pin 25 is bent, the ferrule 20 having a mirror finish is used. , 20 cannot make full use of the accuracy of the joint surface, and there is a large variation in the optical transmission loss when the ferrules 20, 20 are attached or detached, and the resistance when the guide pin 25 is fitted in the guide pin fitting hole 23 However, there was a problem that the connection work was difficult.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a multi-fiber optical connector having extremely small variation in optical transmission loss when attaching and detaching a ferrule and having excellent workability.

[0005]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention provides a multi-fiber optical connector in which a pair of ferrules to be connected, which are attached to an end portion of an optical fiber core having an optical fiber exposed for a predetermined length, are connected by guide pins. A small-diameter portion having a predetermined length is formed at both ends of the guide pin to form a multi-fiber optical connector.

[0006]

[Action]

 By forming a small diameter part with a predetermined length at both ends of the guide pin within the range that can secure the adhesion accuracy on the mating surfaces of the ferrules, the guide pin or the guide pin fitting hole formed in the ferrule is formed. It is possible to prevent deterioration of the adhesion accuracy at the joint surface of the ferrules due to bending. Further, the resistance when inserting the guide pin into the guide pin fitting hole formed in the ferrule is small, and the connecting work becomes easy.

[0007]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is an exploded sectional view, and FIG. 3 is an enlarged sectional view of an essential part. In the figure, 1 and 1 are a pair of ferrules to be connected, 2 and 3 are ferrules 1. Optical fiber core hole insertion hole and optical fiber insertion hole which are bored in communication with the shaft center of, and 4 and 4 are optical fiber core wire insertion hole 2 and optical fiber insertion hole which are bored in communication with the shaft center of the ferrule 1. Guide pin fitting holes 5 formed through both sides of the ferrule 3 are adhesive injection holes provided on the upper surface of the ferrule 1. Reference numeral 6 denotes an optical fiber core wire in which the optical fiber 6a is exposed by a predetermined length. The ferrules 1 and 1 are attached and fixed to the end portions of the optical fiber core wire 6, respectively, and the ferrule 1 in which the optical fiber is exposed, The bonding surface of No. 1 is mirror-finished by polishing. Reference numeral 7 denotes a guide pin having a small-diameter portion 7a having a predetermined length formed at both ends thereof. The guide pin 7 has a length L ( (For example, about 4 mm), both ends are made smaller than the outer diameter D of the guide pin 7 by about d = D-10 μm.

As described above, the ferrule 1 and the ferrule 1 are formed with the small-diameter portions 7a having a predetermined length at both ends within a range in which the contact precision between the ferrules 1 and 1 can be secured at the joint surfaces. By providing a clearance between the guide pin 7 and the guide pin fitting hole 4, the guide pin 7 or the ferrule 1 caused by the bending of the guide pin fitting hole 4 formed in the ferrule 1 and the mutual joining surface of the ferrule 1 It is possible to prevent the deterioration of the adhesion accuracy and to extremely reduce the variation of the optical transmission loss when the ferrules 1 and 1 are attached and detached. According to the experiment, the variation of the optical transmission loss when the ferrules 1 and 1 were attached / detached was as small as 0.1 dB or less.

Further, by forming the small-diameter portion 7a of a predetermined length at both ends of the guide pin 7, the resistance when the guide pin 7 is fitted into the guide pin fitting hole 4 formed in the ferrule 1 is small. In particular, especially in a switching mechanism in which the guide pins 7 are inserted and removed to switch the connector unit or the optical fiber by a fixed pitch, the connection work becomes extremely easy.

[0010]

[Effect of the device]

 According to the present invention, as described above, not only can the dispersion of the optical transmission loss when the ferrules 1 and 1 are detached from each other be made extremely small, but also the connection work can be remarkably improved. .

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 Exploded sectional view

FIG. 3 is an enlarged sectional view of an essential part.

FIG. 4 is an exploded sectional view showing a conventional multi-fiber optical connector.

[Explanation of symbols]

1 ferrule 4
Guide pin fitting hole 6 Optical fiber core wire 6a
Optical fiber 7 Guide pin 7a
Small diameter part

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Masami Saito, 2-6-1, Marunouchi, Chiyoda-ku, Tokyo Furukawa Electric Co., Ltd. (72) Hiroyuki Yamada 2-6-1, Marunouchi, Chiyoda-ku, Tokyo Furukawa Electric Co., Ltd. (72) Shinji Nagasawa 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation

Claims (1)

[Scope of utility model registration request] 1. A multi-fiber optical connector in which a pair of ferrules to be connected, which are attached to an end portion of an optical fiber core wire where an optical fiber is exposed for a predetermined length, are connected to each other by guide pins, and a predetermined length is provided at both ends of the guide pin. A multi-fiber optical connector characterized in that a narrow diameter portion is formed.