JP2001290046A - Dustproof cap for optical connector plug - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive dustproof cap for an optical connector plug, a cap having a function of preventing the cap from falling off from an optical connector plug and a function of easily and quickly engaging with, attaching to and detaching from the plug through one action. SOLUTION: In the elastic freely engaging dustproof cap C that is freely attachable to and detachable from the tip of an optical connector plug P, a slot 9 which fits to the outside of an engaging projection 5 of the optical connector plug P is provided near the opening of the dustproof cap C. In addition, a guiding tapered part 10, 10', which is for the engaging projection 5 of the optical connector plug P, is formed at the front and/or the rear end of the inner surface 7a of a side wall 7 between the tip of the slot 9 and the opening 6 of the cap.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a dust-proof cap for an optical connector plug.

[0002]

2. Description of the Related Art A conventional dustproof cap for an optical connector plug is constructed as shown in FIGS. That is, the engagement protrusion a is provided at the center of the upper surface of the distal end of the optical connector plug P. On the other hand, the dustproof cap C which is removably and elastically fitted to the distal end of the optical connector plug P has an open end b. At the center, a long hole c that is fitted to the engagement protrusion a is formed.

[0003]

However, when the dustproof cap C is fitted to the tip of the optical connector plug P, the dustproof cap of the conventional optical connector plug as described above, as shown in FIG. Since the elongated hole c formed at the opening end b of the dustproof cap C is merely fitted to the engagement protrusion a of the P, the dustproof cap C is easily pulled out of the optical connector plug P, and dust is removed from the ferrule or the like. In addition, problems such as poor contact due to intrusion and adhesion of dust easily occur.

[0004] Further, in the structure of the dust-proof cap, there is a problem that the quality tends to vary, such as those that are easy to come off and those that are hard to come off. Further, in order to prevent such a variation in quality, it is necessary to raise the product design system, which causes a problem that the production cost is increased.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the related art, and has an elongated hole which is fitted to an engagement projection of an optical connector plug near an opening of a dustproof cap. By forming the guide taper part, it has the function of preventing the dust-proof cap fitted to the optical connector plug from coming off and the function of easily and quickly fitting and removing the dust-proof cap to and from the optical connector plug with one touch. ,
An object of the present invention is to provide a low-cost dustproof cap for an optical connector plug.

[0006]

In order to achieve the above object, a dustproof cap for an optical connector plug according to the present invention is provided.
According to the first aspect of the present invention, in the dust-proof cap that is removably and resiliently fitted to the distal end of the optical connector plug, a long hole externally fitted to the engaging projection of the optical connector plug is formed in a side wall near the opening of the dust-proof cap. It is characterized by having done.

According to a second aspect of the present invention, in the dustproof cap which is removably and elastically fittable to the tip of the optical connector plug, an elongated hole externally fitted to the engaging projection of the optical connector plug is provided near the opening of the dustproof cap. A guide taper part for engaging projection of the optical connector plug is formed at the front end, the rear end, or the front and rear ends of the front end, the rear end, and the front and rear ends of the front end of the long hole and the inner surface of the side wall of the cap opening. And

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a dustproof cap for an optical connector plug according to the present invention will be described below with reference to the drawings. FIG. 1 is a front view of the optical connector plug according to the present invention before the dust-proof cap is fitted, FIG. 2 is a front view of the same fitted state, and FIG. FIG. 4 is a front view of a fitting state of the above, FIG. 5 is a plan view of a part (dustproof cap) before fitting, and FIG. It is a top view of a state.

1 to 6, an optical connector plug P includes a ferrule 1 protruding from a tip end thereof,
An optical fiber cord 2 connected and fixed to the rear end of the ferrule 1;
The main components are a plug frame 3 provided inside and a slide knob 4 fitted and externally slidably fitted in the plug frame 3 in the axial direction.

In the center of the front end of the slide knob 4 of the optical connector plug P, an engagement protrusion 5 which is long in the axial direction is integrally formed.

The engagement projection 5 has parallel and vertical locking portions 5a and 5a on both sides, and has locking portions 5a and 5a at the rear end.
And a vertical locking portion 5b, and a tip thereof is a circular and vertical locking portion 5c. In the illustrated example, the engagement protrusion 5 thus formed is provided only on the front side of the slide knob 4, but another engagement protrusion may be provided at the same position on the back side.

On the other hand, in FIGS. 1 to 6, the dustproof cap C is made of an elastic plastic (for example, soft polyethylene) and has an opening 6 into which the slide knob 4 of the optical connector plug P is fitted. Then, it is composed of a rectangular cylindrical side wall 7 viewed from the front and an arc-shaped bottom wall 8 viewed from the plane.

In the center of the dustproof cap C in the vicinity of the front and rear openings 6 of the side wall 7, an elongated hole extending in the axial direction, which is fitted to the engaging projection 5 of the optical connector plug P, is provided. 9 have been established.

At the front end of the elongated hole 9, a locking surface 9 that can be locked to the locking portion 5b at the rear end of the engaging projection 5 of the optical connector plug P.
a, parallel locking surfaces 9b, 9b having the same width with respect to the locking portions 5a, 5a on both sides of the engagement protrusion 5 are formed on both side surfaces, and the rear end of the long hole 9 is An arcuate locking surface 9c of the same shape that locks to the guide surface 5c at the tip of the projection 5 is formed.

The inner surface 7a of the side wall 7 between the locking surface 9a at the end of the elongated hole 9 and the opening 6 of the cap C has front and rear ends for engaging projections 5 of the optical connector plug P. Guide taper portions 10 and 10 'are formed respectively.

As shown in FIGS. 5 and 6, it is desirable that the thickness of the inner surface 7a of the side wall 7 of the cap C in which the guide tapered portions 10 and 10 'are formed at both ends is slightly reduced. This increases the elasticity of the part,
The fitting of the optical connector plug P to the engagement protrusion 5 becomes easy.

In the illustrated example, two guide taper portions 10 and 10 'are provided at the front and rear portions of the inner surface portion 7a of the side wall 7, but the present invention is not limited to this. It may be provided only at a location.

As shown in FIG. 3 to FIG. 6, an elongated hole 9 of the dust-proof cap C is provided on the front and rear inner sides of the opening 6 formed by the side wall 7 of the dust-proof cap C. A locking step 6 with which the distal end surface 4a of the slide knob 4 abuts and locks when completely fitted to the engaging projection 5
a and 6a are opposed to each other and both locking step portions 6a and 6a
In the center of the bottom wall 8 between “a” and “a”, a storage recess 6 b in which the ferrule 1 of the fitted optical connector plug P is stored in a non-contact state is formed so as to communicate with the opening 6.

Further, the front surface of the side wall 7 of the dustproof cap C,
As shown in FIGS. 3 and 5, two flat protrusions 6 c, 6 c parallel to the long hole 9 protrude from upper and lower rear portions of the long hole 9 on both inner surfaces of the rear surface. The dustproof cap C is elastically fitted to the optical connector plug P, and has a function of preventing rattling and the like.

Next, a method of fitting the dustproof cap C to the optical connector plug P will be described. First, as shown in FIGS. 1, 3 and 5, the engagement protrusion 5 of the slide knob 4 of the optical connector plug P and the long hole 9 of the dust-proof cap C are butted together so as to face each other.
When the tip of the slide knob 4 is inserted into the opening 6 as it is, the edge of the opening 6 abuts against the arc-shaped locking portion 5c at the tip of the engaging projection 5 during the insertion. Since the guide taper portion 10 is formed, the inner surface portion 7a of the side wall 7 bulges upward and contacts the upper surface of the engagement protrusion 5, and toward the rear end of the engagement protrusion 5. Moving.

Further, when the dustproof cap C is further pushed forward, the inner surface 7a of the side wall 7 is disengaged from the rear end of the engaging projection 5 and is elastically restored at the same time.
0 ′ is locked to the locking portion 5b at the rear end of the engaging protrusion 5, and the locking surfaces 9b, 9b, 9c of the remaining long holes 9 and the locking portions 5a, 5a, 5c of the engaging protrusion 5 are both The long holes 9 of the dustproof cap C are fitted to the engaging projections 5 of the optical connector plug P.

The fitting operation of the dustproof cap C to the slide knob 4 of the optical connector plug P is completed as described above. 5 is released, and the dustproof cap C can be pulled out of the optical connector plug P.

[0023]

Since the present invention is constructed as described above, it has the following effects. According to the first aspect, since the long hole of the dust-proof cap is externally fitted to the engagement projection of the optical connector plug, the dust-proof cap fitted to the optical connector plug does not easily come off, and therefore, is inadvertent. The present invention does not cause a problem such as poor contact due to dust and dust entering and attaching to the ferrule of the optical connector plug.

According to the second aspect of the present invention, since the guide taper portion for the engagement protrusion of the optical connector plug is formed on the inner surface of the side wall between the tip of the long hole and the opening of the dustproof cap, the dustproof cap is protected from dust. Since the cap can be easily and quickly fitted and removed with a single touch, the operability is the same as that of the conventional product, and the manufacturing cost is low.

[Brief description of the drawings]

FIG. 1 is a front view of an optical connector plug and a dustproof cap according to the present invention before fitting.

FIG. 2 is a front view of the same fitting state.

FIG. 3 is a front view of a part (dustproof cap) before fitting, in which the part (dustproof cap) is longitudinally cut.

FIG. 4 is a front view of the same fitting state.

FIG. 5 is a plan view of a part (dustproof cap) before fitting, which is crossed.

FIG. 6 is a plan view of the same fitting state.

FIG. 7 is a front view of a conventional optical connector plug and a dustproof cap before fitting.

FIG. 8 is a front view of the same fitting state.

[Explanation of symbols]

 P Optical connector plug C Dustproof cap 5 Engagement protrusion 7 Side wall 7a Inner surface 9 Long hole 10, 10 'Guide taper

Claims (2)

[Claims] 1. A dustproof cap which is removably and elastically fittable to a tip end portion of an optical connector plug, wherein a long hole externally fitted to an engagement projection of the optical connector plug is formed in a side wall near an opening of the dustproof cap. A dust-proof cap for an optical connector plug. 2. A dustproof cap which is removably and resiliently fitted to a distal end portion of an optical connector plug, wherein a long hole externally fitted to an engagement projection of the optical connector plug is formed in a side wall near an opening of the dustproof cap. And a guide taper portion for an engagement protrusion of an optical connector plug is formed at the front end, the rear end, or both front and rear ends of the front end of the long hole and the inner surface of the side wall of the cap opening. Dustproof cap for connector plug.