JP2599587Y2 - Single head optical plug - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical connector used for signal transmission of digital audio equipment and the like, and more particularly to a single-head optical plug.

[0002]

2. Description of the Related Art As shown in FIG. 3, a single-headed optical plug 1 based on the JIS single-headed plug standard has a plug body 3 provided at the rear (right side in the figure) of a sleeve 2 by molding. A center hole 4 penetrates the sleeve 2 in the axial direction, and the core 6 of the optical fiber cable 5 is inserted into the center hole 4 so that the distal end surface of the core 6 and the distal end surface of the sleeve 2 match.

[0003]

In the conventional single-head optical plug shown in FIG. 3, the sleeve and the optical fiber cable are linearly arranged. The cable projects considerably backwards. Therefore, there is a problem in that the devices must be installed at an interval from the wall surface behind and space is taken up.

[0004] In order to improve the space efficiency by allowing the device to be installed as close to the wall as possible, a single-head optical plug formed by bending the rear portion of the sleeve has been developed. Due to the curved shape of the sleeve, it is difficult to fix the sleeve to the plug body.

[0005] Therefore, there arises a technical problem to be solved in order to stably fix the sleeve to the plug body, and the present invention aims to solve the problem.

[0006]

According to the present invention, in order to achieve the above object, a core of an optical fiber cable is inserted into a center hole of a sleeve to expose an end face of the core at a tip portion of the sleeve, and In a single-head optical plug formed by curving the rear part of the sleeve, when the plug body is sheathed by injection molding at the curved part, the outer peripheral part of the sleeve at the part covered by the plug body is formed. A stopper is pressed into an end of a cable lead-out hole formed at a rear portion of the sleeve in the plug body, and an optical fiber cable inserted from the cable lead-out hole is inserted by the stopper. The present invention proposes a single-head optical plug configured to be fixed to a plug body.

[0007]

The rear portion of the sleeve supporting the core of the optical fiber cable is curved and is housed in the plug body. The plug body is formed integrally with the rear outer peripheral surface of the sleeve by injection molding. At this time, since the flange is protruded from the curved portion of the sleeve, the sleeve is stably fixed to the plug body formed by the injection molding. Further, the optical fiber cable inserted from the cable lead-out hole formed in the rear part of the plug body is stably fixed by the stopper press-fitted into the end of the cable lead-out hole.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to FIGS. For convenience of description, a conventionally known configuration will be described at the same time. FIG. 1 shows a single-headed optical plug 11, in which a sleeve 13 projects from one end of an L-shaped plug body 12 formed by injection molding, and an optical fiber cable 14 is inserted into the other end. The sleeve 13 is formed so as to form a relative angle of about 90 degrees. The diameter of the sleeve 13, the protruding length, the dimensions of the tip portion 13a, etc. are based on the single-head plug standard of JIS. Is what you do.

As shown in FIG. 2, the sleeve 13 is a tubular member having an axial center hole 15 formed at the center thereof, and a flange 13b is provided at a front and rear intermediate portion of the outer periphery to prevent the sleeve 13 from coming off. Then, the sleeve 1 previously formed into a straight tubular shape
3 is curved at a predetermined curvature. The curvature is set in accordance with the reflection angle characteristics in the core 16 so that the transmission loss of the optical fiber cable 14 caused by bending the sleeve 13 is within an allowable range. The sleeve 13 bent and formed based on the above setting is integrally housed and fixed in the plug body 12 by subjecting the plug body 12 to injection molding and exteriorization.

Single-head optical plug 11 completed by integral molding
Is installed by inserting the optical fiber cable 14 from the cable outlet 17 at the rear. Optical fiber cable 14
Removes a predetermined length of the outer coating 18 from the distal end, exposes the core 16 coated with the clad (not shown), and inserts the core 16 from the cable lead-out hole 17 into the inside. After the core 16 is inserted through the center hole 15 of the sleeve 13 until it protrudes from the tip of the sleeve 13, the stopper 1 previously mounted on the optical fiber cable 14 is inserted.
9 is pressed into the cable outlet hole 17. The stopper 19 is provided between the inner peripheral surface of the cable outlet hole 17 and the optical fiber cable 1.
The single-head optical plug 11 is fixed to the optical fiber cable 14 by press-fitting between the outer peripheral surfaces of the optical fiber cable 14.

Next, the front end surface of the core 16 projecting from the front end surface of the sleeve 13 is polished to be flush with the front end surface of the sleeve 13 so that the number of parts can be reduced as much as possible. Is completed.

It should be noted that the present invention is not limited to the JIS standard single-head optical plug of the above embodiment, and various modifications can be made. And it goes without saying that the present invention extends to those modifications.

[0013]

According to the invention, as described in detail in the above embodiment, the rear portion of the sleeve is curved and formed, the plug body is externally formed on the curved portion by injection molding, and the outer periphery of the sleeve at the curved portion is formed. Since a flange is protruded in the part,
The sleeve is integrally and stably fixed to the plug body by injection molding of the plug body. Further, the optical fiber cable inserted into the plug body from the cable lead hole formed in the rear part of the plug body can be stably fixed by the stopper pressed into the end of the cable lead hole. .

[Brief description of the drawings]

FIG. 1 shows a single-headed optical plug of the present invention, wherein (a) is a front view, (b) is a side view, and (c) is a bottom view.

FIG. 2 is a sectional view of FIG.

FIG. 3 is a side view of a conventional single-head optical plug.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Single-head optical plug 12 Plug body 13 Sleeve 14 Optical fiber cable 15 Center hole 16 Core 17 Cable lead-out hole 18 External coating 19 Stopper

Claims (1)

(57) [Scope of request for utility model registration] 1. A single-headed optical plug, wherein a core of an optical fiber cable is inserted into a center hole of a sleeve to expose an end face of the core at a tip end of the sleeve, and a rear portion of the sleeve is curved. When the plug body is sheathed by injection molding on the curved portion, a flange is provided on an outer peripheral portion of the sleeve at a portion sheathed by the plug body to prevent the sleeve from coming off. A stopper is press-fitted into an end of a cable lead-out hole formed at a rear portion of the sleeve, and the stopper is used to fix an optical fiber cable inserted from the cable lead-out hole to the plug body. Head light plug.