JPH0675125A - Optical fiber cable holder - Google Patents

Abstract

PURPOSE:To facilitate the fixing and removing of the surplus length of an optical fiber cable and to hardly flaw the optical fiber cable by holding the surplus length part by movable holding members and fitting a mounting projection of a stationary shaft member into the hole of a printed wiring board. CONSTITUTION:The stationary shaft member 26 having an approximately cylindrical shape has the mounting projection 28 in its lower part. The mounting projection 28 is formed to a drum shape having a contracted part and slits 30 of, for example, a V shape are formed longitudinally at this mounting projection 28. The stationary shaft member 26 is integrally molded of a plastic resin. The movable holding members 32 have a shape quadrisecting a toric member having a U-shaped section in a circumferential direction. The movable holding members 32 consist of a plastic resin. The peripheral surfaces of the respective movable holding members 32 are connected by means of elastic material members 34 to the flank of the stationary shaft member 26. The elastic material members 34 are band-shaped leaf springs made of metal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber cable holder used to hold an extra length of an optical fiber cable.

Optical fiber cables are used not only for transmission lines but also for connection cables between devices and circuit connections inside devices. In order to improve the assembling property and maintainability of the device, it is desirable to provide an extra length of the optical fiber cable instead of laying the optical fiber cable introduced into the device at the shortest distance. Therefore, there is a demand for an optical fiber holder that can easily hold the extra length of the optical fiber cable.

[0003]

2. Description of the Related Art FIG. 8 is an explanatory diagram of a conventional general extra length process. The optical fiber cables 6A and 6B introduced into the printed wiring board unit 4 through the input / output port 2 are
The printed wiring board unit 4 is wound several times with the extra length 8
Are connected to the optical modules 10 and 12, respectively. The optical modules 10 and 12 are, for example, an optical transmitter and an optical receiver, respectively. The extra length portion 8 of the optical fiber cable is fixed to the printed wiring board unit 4 by, for example, two fiber holding portions 14.

FIG. 9 is a diagram showing a specific example of the fiber holding section 14 of FIG. In the example shown in FIG. 9A, the conductor pattern 18 for holding the fiber is formed in advance on the printed wiring board 16 of the printed wiring board unit, and the strap wire 20 is soldered to the conductor pattern 18. The optical fiber cable 6 is held by the strap wire 20.

In the example shown in FIG. 9B, FIG.
The metal fitting 22 is fixed by soldering to the conductor pattern 18 similar to that in the above, and the nylon band 24 is wound around the optical fiber cable 6 and the metal fitting 22.

[0006]

In the case of the above-mentioned prior art, there is a problem that it takes time to fix and remove the extra length portion of the optical fiber cable. In addition, it is necessary to specify the position of the fiber holding part at the designing stage of the printed wiring board. On the other hand, the length of the optical fiber cable introduced into the printed wiring board unit varies. When the diameter of the extra length of the optical fiber cable is different from the distance between the fiber holding portions 14, 14, the extra length of the optical fiber cable becomes elliptic, and the optical fiber cable is easily scratched due to friction or the like. It was

It is an object of the present invention to provide an optical fiber cable holder in which the excess length of the optical fiber cable can be easily fixed and removed and the optical fiber cable is not easily scratched.

[0008]

In the optical fiber cable holder of the present invention, a fixed shaft member having a mounting projection at the bottom and an annular member having a U-shaped cross section are circumferentially divided into a plurality of parts. And a elastic member that connects each of the movable hold members to the fixed shaft member.

Preferably, the movable holding member has a shape in which an annular member having a U-shaped cross section is divided into four parts.

[0010]

According to the present invention, the extra length of the optical fiber cable is held by holding the extra length of the optical fiber cable by the movable hold member and fitting the mounting projection of the fixed shaft member into one hole of the printed wiring board. The processing can be performed easily and surely. Further, since each movable hold member is connected to the fixed shaft member by the elastic member, it is possible to absorb the variation in the length of the optical fiber cable, and the optical fiber cable is less likely to be damaged during the extra length treatment. .

[0011]

EXAMPLES Examples of the present invention will be described below. Figure 1 (A)
Is a plan view of an optical fiber cable holder showing an embodiment of the present invention, and FIG. 1 (B) is an end view of the optical fiber cable holder taken along the line (B)-(B).

The generally cylindrical fixed shaft member 26 has a mounting projection 28 at its lower portion. The mounting protrusion 28 is
It has an hourglass shape having a constricted portion, and a V-shaped slit 30, for example, is formed in the mounting projection 28 in the vertical direction. In this embodiment, the fixed shaft member 26 is integrally molded of plastic resin.

The movable holding member 32 has a shape obtained by dividing an annular member having a U-shaped cross section into four equal parts in the circumferential direction. In this embodiment, the movable hold member 32
Is made of plastic resin.

The inner peripheral surface of each movable hold member 32 is connected to the side surface of the fixed shaft member 26 by an elastic member 34. In this embodiment, the elastic member 34 is a metal strip spring.

FIG. 2 (A) is a plan view before fixing the optical fiber cable holder of FIG. 1 to a printed wiring board, and FIG. 2 (B) is an end view in the section (B)-(B) at that time. Is.

The fixed shaft member 2 is previously attached to the printed wiring board 16.
A hole 36 into which the mounting projection 28 of 6 is fitted is formed in advance.
The optical fiber cable 6 to be processed for extra length is wound around the movable hold member 32 a plurality of times (for example, 5 to 6 times).
Then, in this state, the bottom surface of the movable hold member 32 is brought into close contact with the top surface of the printed wiring board 16, and the fixed shaft member 26 is pushed in the direction of the arrow in FIG. Fit into the hole 36 of the wiring board 16.

FIG. 3 is a view corresponding to FIG. 2 showing a state after the optical fiber cable holder is fixed to the printed wiring board. When the bottom surface of the movable hold member 32 is in close contact with the top surface of the printed wiring board 16 and the mounting projection 28 of the fixed shaft member 26 is fitted into the hole 36 of the printed wiring board 16, the elastic member 34 is It elastically deforms so as to bend itself, and its elastic force acts in the direction of expanding the movable hold member 32. Therefore, the optical fiber cable 6
Extra length processing can be performed without slackening.

In this embodiment, when the elastic member 34 is contracted most, that is, when the end faces of the movable hold members 32 are in contact with the end faces of the adjacent movable hold members, an annular member (four movable holds) is provided. The diameter of the optical fiber cable housing portion of the assembly of the members 32) is set to 60 mm. By doing so, the diameter of the extra length of the optical fiber cable is 60
Since it does not become smaller than mm, there is no risk of transmission loss due to bending of the optical fiber.

FIG. 4 is a plan view of the extra length processing unit corresponding to FIG. In this embodiment, the optical fiber cables 6A and 6B introduced into the printed wiring board unit 4 through the input / output port 2 are wound around the optical fiber cable holder of FIG. It is connected to the optical modules 10 and 12 mounted in.

In this embodiment, since one hole is formed in the printed wiring board 16 to fix one optical fiber cable holder to the printed wiring board 16, it is easy to process the excess length of the optical fiber cable. is there.

Further, as well shown in FIGS. 1 to 3, the slit 30 is formed in the hourglass-shaped mounting projection 28 having the constricted portion, so that the optical fiber cable holder for the printed wiring board 16 is provided with a slit 30. Easy to put on and take off.

When the lengths of the optical fiber cables are varied and the slack is to be absorbed, it is set as shown in FIG. 5 is a plan view and an end view of the optical fiber cable holder when the optical fiber cable has a slack, corresponding to FIG. 3, and FIG. 6 is a plan view of a surplus length processing unit corresponding to FIG. Is.

When the optical fiber cable 6 has a slack, the elastic member 34 expands and the movable holding member 32 expands, and the extra length of the optical fiber cable can be processed while maintaining a substantially circular shape. Therefore, unlike the case of the conventional technique, there is no fear that the extra length portion of the optical fiber cable becomes elliptical, and since the movable hold member 32 is made of plastic resin, there is no risk of the optical fiber cable being damaged.

FIG. 7 is an end view showing an example in which the optical fiber cable holders are stacked in two stages. When the optical fiber cable holders are stacked in two stages, a stacking hole 36 having a shape corresponding to the mounting protrusion of the upper optical fiber cable holder is formed above the fixed shaft member 26 of the optical fiber cable holder located on the lower side. Is formed.

With this arrangement, the two optical fiber cable holders can be stacked and fixed on the printed wiring board 16, so that when the space for the extra length treatment is limited, a plurality of extra length treatments can be performed in the space. It is possible to save space.

Further, since the movable hold member in each optical fiber cable holder can be independently moved,
The extra length can be processed at one place without slackening the optical fiber cables having different lengths.

In the illustrated example, the case where the optical fiber cable holders are stacked in two stages is illustrated, but the optical fiber cable holders can be stacked in three stages or more in the same manner.

[0028]

As described above, according to the present invention,
It is possible to provide an optical fiber cable holder in which the extra length of the optical fiber cable can be easily fixed and removed and the optical fiber cable is not easily scratched.

[Brief description of drawings]

FIG. 1 is a plan view and an end view of an optical fiber cable holder showing an embodiment of the present invention.

FIG. 2 is a plan view and an end view of the optical fiber cable holder before being fixed.

FIG. 3 is a plan view and an end view of the optical fiber cable holder after being fixed.

FIG. 4 is a plan view of an extra length processing unit corresponding to FIG.

FIG. 5 is a plan view and an end view of the optical fiber cable holder when the optical fiber cable has slack.

FIG. 6 is a plan view of an extra length processing unit corresponding to FIG.

FIG. 7 is an end view showing an example in which optical fiber cable holders are stacked in two stages.

FIG. 8 is an explanatory diagram of extra length processing.

9 is a diagram showing a specific example of the fiber holding unit of FIG.

[Explanation of symbols]

 26 Fixed Shaft Member 28 Mounting Protrusion 32 Movable Hold Member 34 Elastic Member

Front page continuation (72) Inventor Katsunori Suzuki 1015 Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Fujitsu Limited

Claims (5)

[Claims] 1. A movable holding member (32) formed by dividing a fixed shaft member (26) having a mounting projection (28) at its lower portion and an annular member having a U-shaped cross section into a plurality of portions in the circumferential direction. ), And the movable hold member (32) with the fixed shaft member (2
An optical fiber cable holder comprising an elastic member (34) connected to 6). 2. The mounting projection (28) is in the shape of an hourglass having a constriction, and the mounting projection (28) has a slit (3) in the longitudinal direction.
0) is formed, The optical fiber cable holder according to claim 1. 3. The fixed shaft member (26) and the movable hold member (32) are made of plastic resin, and the elastic member (34) is a metal leaf spring. The described optical fiber cable holder. 4. The curvature of the movable hold member (32) is set so that the diameter of the annular member when the elastic member (34) is contracted most is 60 mm or more. The optical fiber cable holder according to claim 1. 5. The stacking hole (36) is formed in an upper portion of the fixed shaft member (26).
The optical fiber cable holder described in.