JPS5834402Y2 - Optical fiber cable holding structure - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a structure for holding an optical fiber cable in a housing when the optical fiber cable is introduced into or led out from the housing of an apparatus.

Conventionally, when an optical fiber cable is introduced into a device such as a modulator/demodulator, a holding structure as shown in FIG. 1 is used.

This is done by attaching a concave die 3 near the cable introduction hole 2 of the device housing, placing a cushioning material 4 such as rubber in the recess of the die 3, and inserting the cable into the introduction hole 2 on top of that. The optical fiber cable 5 is placed on it, and a restraining plate 6 is tightened from above with a fixing screw 7 to fix the optical fiber cable 5.

Such a holding structure has the following drawbacks.

In other words, since this structure has a constant cable holding force, it is necessary to always hold the cable with a large force regardless of the magnitude of the cable's tensile force.Therefore, since the optical fiber cable is pressed on a certain set of blades, its characteristics Causes deterioration.

Also, once slipping occurs, it will not return to its original state.

In addition, optical fiber cables have a fixed minimum bending radius, and if they are bent further than this, the characteristics will deteriorate, so a bending radius adjusting plate 8 is used as shown in the figure, but it is useless if the bending direction changes, and the cable 5 is suddenly bent at the end face of the die 3 and subjected to excessive force, deteriorating its characteristics.

The present invention has been devised to improve these drawbacks.

Therefore, in the present invention, a cylindrical case is formed from a flexible material such as rubber or synthetic resin, and one end of the cylindrical case is provided with a flange that can be attached to the housing, and the other end is provided with a flange that can be attached to the housing. The part is tapered to increase flexibility, and the inside accommodates a cable holding part made of a spirally wound wire slightly thinner than the outer diameter of the optical fiber cable to be held, and one end of the cable holding part is attached to the case. It is characterized by being fixed.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 2 shows a cross section of the embodiment.

In the figure, reference numeral 9 denotes a cylindrical case made of a flexible material, such as rubber or flexible synthetic resin, with a mounting flange 10 provided at one end and a mounting flange 11 at the other end. is tapered to increase flexibility.

A cable holding member 12 is housed inside this case 9.

This cable holding member 12 has a plurality of wire rods 13 arranged in parallel as shown in FIG.
The optical fiber cable is fixed to the optical fiber cable and wound into a spiral shape as shown in FIG. 4, the inner diameter of which is slightly smaller than the outer diameter of the optical fiber cable to be held.

Further, when this cable holding member 12 is housed in the case 9, one band 14 is fixed to the case, and the other band 15 is formed to have a margin l for movement in the axial direction.

The band 14 can be fixed to the case 9 by fixing it between the shoulder 17 on the inner diameter of the case 9 and the case 16 when the flange 10 is fixed to the case 16 as shown in FIG. 2, or by using adhesive. It may also be fixed by other means such as screws or bolts.

This embodiment thus constructed is used by fixing the flange 10 to the housing 16 with screws 18 and inserting the optical fiber cable 19, as shown in FIG.

When used in this manner, even if a tensile force in the direction of arrow P is applied to the optical fiber cable 19, it is held in place by the cable holding member 12.

That is, when the cable holding member 12 tries to move the optical fiber cable 19 in the direction of the arrow P, the spiral wire 13 has one end fixed to the case 9, so the other end is pulled.

Therefore, the inner diameter of the spiral wire rod is reduced, and the optical fiber cable 19 is tightened.

This tightening effect becomes stronger as the tensile force increases.

Therefore, even if the cable holding member 12 normally holds the optical fiber cable 19 with a light tightening force, a tightening force corresponding to the tensile force is dynamically generated to hold it in place.

Further, since the tip of the case 9 is tapered to provide flexibility, the optical fiber cable 19 can be prevented from being bent sharply and can be bent in any direction.

As explained above, the optical fiber cable holding structure of the present invention is capable of automatically adjusting the holding force of the optical fiber cable and rapidly adjusting the holding force of the optical fiber cable by providing a cable holding member formed by spirally winding a wire in a flexible case. This makes it possible to prevent bending.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view of a conventional optical fiber cable holding structure, Fig. 2 is a sectional view of an optical fiber cable holding structure according to an embodiment of the present invention, and Fig. 3 is an expanded view of the cable holding member. FIG. 4 is a front view of the cable holding member. 9...Case, 10...Flange part,
11...Taper part, 12...Cable holding member, 13...Wire rod, 14°15...
... Band, 16 ... Housing, 19 ...
・Optical fiber cable.

Claims (1)

[Scope of utility model registration request] A cylindrical case is formed from a flexible material such as rubber or synthetic resin, and one end of the case is provided with a flange that can be attached to the housing, and the other end is formed into a tapered shape. This is an optical fiber cable holding part that has increased flexibility and houses a cable holding part made of a spirally wound wire slightly thinner than the outer diameter of the optical fiber cable to be held, and one end of which is fixed to the case. structure.