CN85103526A - Optical cable - Google Patents

Abstract

Optical cable has the close passage 6 in the protective sleeve of being formed at of a plurality of longitudinal extensions; and each passage is by the part connection of protective sleeve outer wall; have at least on its mesospore (5) its wall thickness along the direction attenuate of passage 6 zone (8) therefore formed a strip; it makes protective sleeve do easily to wear, so the passage of a discrepancy is provided to the fiber optics (7) in passage (6).Fracture flexible wire (9) can embed wall (5), so when breaking flexible wire (9), will go up at wall (8) and form a slit cut.

Description

Optical cable

The present invention is relevant with the optical cable that has one or more fiber optics in a protective sleeve; particularly such optical cable; it is the fuse that it includes central authorities; around the outer wall of this fuse and extend in fuse and outer wall between blade; between these blades, form a plurality of vertical passages, wherein have at least one will be used for holding one or more fiber optics.

In order to provide the turnover path of optical fiber in these passages, for example to repair for being used for, the connection of part fiber and/or replacing put at existing cable protection and to establish a slit.But when on whole cable length, and on its each passage, all need this slit, proved that this cable normally can not meet the demands.When requiring that anti-aqueous medium is filled in passage, this slit is difficult to this medium is remained in the passage in addition.

By this optical cable among the present invention; the wall of protective sleeve is to form like this: along passage vertically have a zone at least, the thickness of its wall has reduced, thereby forms a weak band; it is penetrated protective sleeve easily, so that the path of an access way is provided.

Be easy on any desirable position that thickness reduces on the protection jacket wall, form a narrow slit, and keep remainder and other passage closure of passage along corresponding passage.On this position, just provided the path that enters into channel interior, can replace optical fiber easily at this, needn't cut the outer wall of respective channel with knife or other instrument.

Strip on optical cable one end passage is torn, and just can obtain the terminal path to passage of long cable.For strip is torn easily, a fracture flexible wire is placed in the contiguous place of inside surface in the zone of reduced thickness.

Do the zone of reduced thickness enough tinyly, on the wall of the one side of this regional direct neighbor, add an inside pressure and just can on the optical cable wall, form a slit.

The another kind of method that forms narrow slit is to embed a wedge on the optical cable wall of area of reduced thickness, as desirable plastic material.Its advantage is if wedge has opening device, can optical fiber contained in each passage be brought out together by it.

According to the present invention, the line district of two such weaknesses is arranged on another concrete optical cable, whole belt can be at an easy rate removed and is stayed next slit from the remainder of protective sleeve, and this has just provided and has entered the path that goes in the passage.

Protective sleeve forms with the mold pressing of thermoplastics type's material.In the process of mold pressing, fiber optics is added in the protective sleeve.In this mold process, the fracture flexible wire that need provide also joins in the protective sleeve together.

Contain a reinforcement in the fuse of optical cable central authorities.If desired, in each passage, can fill waterproof or semisolid or pulverous other material.

The outer wall of protective sleeve has the zone of a reduced thickness, and it longitudinally extends on each passage always.The flexible wire that also can not rupture can be arranged in this zone.

According to the present invention, and, two concrete optical cables and their manufacture method are described below as an example referring to accompanying drawing.Fig. 1 and Fig. 2 all represent the perspective view of cable section.

The optical cable that Fig. 1 provides comprises a protective sleeve that is molded into thermoplastic material, and protective sleeve has an interior fuse 1 around central reinforcement 2, is 4 blades in the polynary blade 3(example) and outer wall 5.Fuse 1, blade 3 and outer wall 5 form an integral body mutually, have formed a plurality of close passage 6 between them.

Contain one or more fiber optics 7 in each passage 6, protection have on the jacket wall longitudinal extension wall thickness reduction zone 8, this zone is positioned at the core of each passage.Thin fracture flexible wire 9 dacron or similar material is embedded on the wall of each reduced thickness of protective sleeve, and is close to its inside surface.So show as Fig. 9 .1 by being pulled outwardly this root fracture flexible wire 9, just on wall, form a narrow slit 10.If desired, also can partly embed fracture line 9 in the material of wall.

In the optical cable manufacture process, the mould feed-in of the reinforcement at center, protective sleeve forms around its mold pressing.Mould also makes in protective sleeve and to form access desired 6, and fiber optics 7 will be sent in the pipeline of narrow internal diameter of this softness, as what introduced in the patented claim No.8236506 that awaits the reply.Also form longitudinal region 8 than minor diameter with this mould, this zone is arranged in the outer wall 5 of the cover on passage 6 opposites, is in the center.The flexible wire 9 that ruptures simultaneously adds by mould, and it is embedded in the tiny scope 8 of wall, near inside surface tightly.

Still be soft when in addition, optical cable comes out from mould.Protective sleeve is along its axial vibration, and it is certain excessive that the optical fiber of sending into 7 is had, and therefore in optical cable formed, fiber optics was longer than protective sleeve, they very loose ground be comprised in each passage.

Can see when the protective sleeve outer wall forms at first, not having narrow slit or any eye, so fill the watertight anti-aqueous medium of to pack in the passage if desired.

But, the fiber that is included in the passage will be come out at an end of optical cable or along breaking flexible wire 9 on any one predetermined point on the passage.

Unified mutually or technological process independently respectively makes protection be with second exterior skin before and after adopting, and it is sticking attached on the protective sleeve, so concerning the purpose of peeling off, can make protective sleeve be easy to expose.

If wish; each limit that is positioned at the fracture flexible wire on each protective bulkhead that contains the flexible wire that ruptures can form a pair of pit; to tear a web strip and stay next long fluting from the protection jacket wall effectively so break flexible wire, it provides desired optical fiber to enter the path of each passage.

In some cases; fracture flexible wire 9 can dispense; the zone 8 that existing thickness is reduced is enough tiny, so no matter to be that a end at optical cable tears it or to the side pressurization in this zone of direct vicinity of channel outer wall, can easily open protective sleeve along this zone.Penetration channel also can utilize the wedge that is inserted on the regional desired location that reduces along thickness to finish.This wedge is plastics, and it can avoid damaging any fiber in the passage.

According to the present invention, the concrete form of second optical cable is provided by Fig. 2.Wherein optical cable is by providing 4 wood chips in the fuse 11 around the central reinforcement 12 of being centered around of forming of mold pressing, the polynary blade 13(example) and protective sleeve 15 form.Fuse, blade and protective sleeve form one mutually, and have determined vertical passage 16 between them.

In manufacture process, when fuse 11 is to form around reinforcement 12 mold pressings, fiber optics IV feed-in passage 16.When carrying out this step process, passage vibration makes the excessive feed-in of fiber, so fiber is longer than passage, and loose ground is contained in the passage, can move freely.

In mold process; the protective sleeve part 15 of formed each passage has thin part 18; its width is 3mm; or width as requested, an extremely thin zone is arranged, when when pulling it at its edge; it just puts from main protection and tears off; become a strap 19, stay a slit cut simultaneously, the length of otch can be on request.

Tearing off before part tears, optical cable be one complete not with perforate, avoid the infiltration of water if therefore wish the optical cable complete filling, can insert packing materials such as watertight anti-aqueous medium, can not leak.

After being with 19 to tear off, will come out fiber at any predetermined point or at the end of optical cable, this facilitates the connection of optical cable or other requirement to path is provided.

Whole optical cable can add second protection covering, and it can be finished with unified technological process in front and back or the technological process of separating, and its not attached first mold pressing thing that adheres to is so that peel off easily.

Claims (7)

1, optical cable, by central fuse, around the outer wall of fuse and extend in fuse and outer wall between blade form, these blades are being divided into a plurality of passages longitudinally between fuse and the outer wall, have at least a passage to be used for holding one or more fiber optics in these passages, the characteristics of optical cable are to have at least on its outer wall one vertically along the zone that the wall thickness of passage has reduced, and form a strip thus, it makes wall do easily to wear, to be given to the turnover path of passage.

2, according to the optical cable of claim 1, the zone of a wall thickness reduction is wherein arranged, it is along each passage longitudinal extension.

3, according to the optical cable of claim 1 or 2, the flexible wire that wherein ruptures is the inside surface place that is placed in the zone of contiguous each reduced thickness.

4, according to the optical cable of claim 1 or 2, two zones along the wall thickness reduction of passage longitudinal extension are wherein arranged, at this two area limiting one band, in use, this strap can be pulled away from from the remainder of outer wall and come, and on outer wall, stay next slit cut, it provides the discrepancy path of passage.

5, according to the optical cable of any one above-mentioned claim, wherein said fuse, outer wall and blade constitute an integral body-thermoplastic material moulded body.

6, according to the optical cable of any one above-mentioned claim, include a reinforcement in the fuse of wherein said central authorities.

7, according to the optical cable of any one above-mentioned claim, wherein in a described passage, include anti-aqueous medium at least.

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