HU230425B1 - Optical fiber cable and optical unit extraction method - Google Patents

Abstract

An objective of the present invention is to provide an optical fiber cable whereby it is easier to split the outer covering with a notch as a starting point of said split and to extract an internal optical unit, and which is not prone to experiencing transfer loss in the optical fiber due to cable bending or temperature changes. Provided is an optical fiber cable (1) which is formed by encasing in an outer sheath (3) having a rectangular cross-section shape an optical unit (2) which houses a plurality of optical fibers (5) within a film (4) which is formed in a cylindrical shape such that both ends overlap. In the outer sheath, tensile strength bodies (12) are positioned on either side of the optical unit along a common line, and release papers (13) are positioned in parallel with the common line along which the optical unit and the tensile strength bodies are positioned which sandwich the optical unit therebetween above and below for extracting the optical unit. Two notches (11) for splitting the outer sheath are further disposed respectively on the upper and lower faces of the outer sheath in the longitudinal sides thereof, and the optical unit is not positioned in lines (S1) which join vertically opposing pairs of the notches.

Description

Fiber optic cable and a method of selecting an optical unit for a belt

The present invention relates to a fiber optic cable according to the preamble of claim I and to a method of separating the optical unit from the fiber optic cable according to the preamble of claim 5,

JP-4215260 discloses a structure in which a protective wall containing plastic or metal is enclosed in a rectangular casing in which a ribbon cable made of fiber optic cables is mounted so as to prevent the inner fiber optic cable from being damaged. the tube is pierced.

JP-209-229786 discloses a device in which a fiber optic s / ribbon cable placed on a rectangular cross section of a tuft is covered with a cover to prevent the fiber optic ribbon &

In the case of the fiber optic cable described in Patent Publication jP-42i5260, if the casing opens from the incision formed to remove the fiber optic cable, the individual conductive filaments cannot move through the casing completely because of the opaque conductive strip. when the sheath is formed, which will cause transmission loss in fiber optic fibers due to bending of the cable or temperature change,

In the case of a fiber optic cable described in JP-2J-229'78-2, although there is no problem that the casing material surrounds and cuts into the inner fiber optic cable, the size of the fiber optic cable is increased by the size of the spacer.

JP 2005 283763 A discloses a fiber optic cable in which optical units consisting of optical fibers extending inside a cylindrical layer are protected by a sheath of rectangular cross-section. On the inside of the sheath, nesting members are arranged on both sides of the optical unit and an incision is formed for splitting. JP 2008 070601 A discloses a fiber optic cable in which an optical unit consisting of optical fibers within a housing is stored in contact paper with a direct contact therewith,

The square U-shaped spacer brackets can be easily removed from the cable by splitting the casing starting with the notches, but the Pia is a spacer screw when the ··%

- .4 fiber optic fibers inserted in the groove are removed or a tool is inserted into the opening, the factual conductive fibers may be directly broken and consequently an immediate increase in loss may occur. Furthermore, since the fiber-optic filaments can only be removed from the square U-aperture, it is extremely difficult to remove the fiber-optic filaments if the square U-aperture is located on the opposite side of the work site.

It is an object of the present invention to provide a fiber optic cable which is capable of easily separating an internal optical unit, a bed, slit a cover from the incisions and capable of reducing transmission loss in fiber optic fibers due to fiber fusion or temperature change. and our object is to provide a method for separating the optical unit.

The object is solved by a fiber optic cable having the features of claim 1 and a method having the features of claim 5.1.

Some of the major preferred embodiments are described in the dependent claims.

For the purposes of the present invention, since the fiber-optic fibers are covered by a cylindrical layer, the optical unit is wholly detached so that the fiber-optic unit is not ejected, even if the casing is applied from the beroet20 sex. According to the invention, since the fiber-optic fibers are wrapped in the layer, the risk of transmission loss is also reduced, even if the cable is bent or the temperature changes because the fiber-optic fibers can move slightly within the layer.

The invention will now be described with the aid of an embodiment. referring to the attached drawing on which

Figure 1 is a cross-sectional view of a fiber optic cable according to an embodiment, a

Figure 2 shows an optical unit covered with a cover, a

Fig. 2A is a perspective view of the optical unit of Fig. 2, a cross-sectional view of the optical unit of Fig. 2,

Figure 3 shows an example of a fiber optic unit mounted in the optical unit shown in Figure 2;

Figure 4 is a cross-sectional view of the light-guide fibers of Figure 3 taken along line A-A. the Fig. 5 is an exploded cross-sectional view showing a separate response of the optical unit; 1 shows the fiber optic cable shown in FIG Figure 6 shows another fiber optic cable according to an embodiment of the present invention example a cross-sectional view of Figure 7 shows a further example of a fiber optic cable according to the present embodiment. and a Figure 8 is a possible cross-section of a fiber optic cable with a support wire view.

As. In the embodiment shown in Fig. L, a fiber optic cable I has a structure in which an optical unit 2 is covered with a rectangular cross-section 3 gray. As shown in FIG. 2, the optical unit 2 is structured such that fiber-optic fibers 5 are arranged in a cylindrical rain of layers so that the ends 4a and 4b of a strip-like layer 4 overlap.

The layer 4 is cylindrical in shape so that the ends 4a and 4b, which may be the widthwise ends of a strip-like plastic layer, form interlaced sections,

2 (1 partially overlapping each other). The layer 4 may also contain other materials as long as they are layered materials capable of accommodating the optical fiber 5.

Preferably, the overlapping layer 4 is secured to each other intermittently or even continuously by means of an adhesive or the like in the longitudinal direction of the 4: X arrow. As a result, the resin material of the 4-layer: 3-wrapper can be prevented from entering through the overlapping portions of the 4-layer.

As shown in Figures 3 and 4, the fiber-optic fibers 5 may, for example, form a strip intermittently fixed together. The intermittently fixed web is structured such that three or more fiber 5A-5D fibers are parallel to each other and adjacent SA-5D optical fibers are interconnected by a plurality of interconnecting portions 7 which, in the longitudinal direction of the tape in Fig. 3: X arrow to it ~

They are formed intermittently in the direction of the width of the strip (in the direction of the arrow Y in Figure 3).

Figure 3 shows a total of four 5 A-5D optical fiber strands. Of the four fiber-optic fibers 5A-5D, each of the adjacent fiber-optic fibers 5 is intermittently connected to the connecting portions 7 both in the longitudinal direction X of the strip and in the direction Y of the perpendicular arrow. The connecting sections 7 for connecting two adjacent optical fiber fibers 5 are formed at predetermined distances P in the longitudinal direction of the strip. For example, the first SA fiber and the. the second fiber optic fiber interconnect portions 7 are formed at predetermined points in the longitudinal direction of the strip. The second is a fiber 5B and a third. The fiber optic fiber interconnecting portions SC and the third optical fiber filament SC and the fourth SD optical fiber interconnecting portions 7 are also formed at predetermined points in the longitudinal direction of the strip.

1.5 In this case, only one connecting part 7 is arranged in the width direction of the strip at each of the locations in order to connect the adjacent light-guide fibers 5. The connecting portion 7 connecting two adjacent optical fiber filaments 5 is not located adjacent to one another in the width direction, and in the same direction as the other connecting portion 7 connecting the two adjacent optical fiber filaments, but located in the longitudinal direction of the tape. Therefore, the interconnecting portions 7 formed in the intermittently fixed ribbon are arranged on a zigzag serum when considered as a whole. It should be noted that the arrangement of the connecting portions 7 is not limited to the configuration shown in Fig. 3 and may be of other configurations. Λ The arrangement shown in Figure 3 is merely an example.

Figure 4 shows a larger scale cross-section of the intermittently fixed tape. The connecting portions 7 are formed so as to expose, between, for example, ultraviolet light-resinable, resin gaps between adjacent optical fiber filaments SA, 514, which are then cured to interconnect the two adjacent optical fiber filaments 5, formed by transposing the longitudinally extensively arranged four light conductive filaments 5 to one another in a longitudinal direction and applying ultraviolet curable curing resin in the interstices between each adjacent filament filament 5 and then transmitting ultraviolet light 5 through the ultraviolet.

In the center of each fiber 5A-5D, the glass comprises a fiber 8 which is surrounded by a fiber wrapping layer 9 and a partially transparent colored layer 10 is applied to the outer surface of the fiber reflection layer 9.

For example, the diameter of the fiber 8 may be 125 µm. The fiber wrapping layer 9 is a resin layer formed to reduce lateral pressure on the glass fiber optic fiber 8 and to protect it from external damage.

The casing 3 has a rectangular cross section as shown in Figure t. More particularly, the square cross section of the casing 3 means that there are

The wall surfaces 3a which extend above and below the example and the short wall surfaces 3b which extend to the left and right of the figure. Each of the upper and lower revenge wall surfaces 3a is provided with two notches 11 for splitting the cover 3. The notches 11 are V-shaped and extend continuously in the longitudinal direction of the fiber optic cable 1. The notches 11, which are formed on each annoying surface 3a, are located along the lines bt connecting the opposite notches 11 to each other on the upper and lower sides, i.e. not where the optical unit 2 is located. Λ The direction of the side of the reed is defined as a vertical direction by dUinialis and the direction of the side of the hoss / u is defined as a horizontal direction, that is to say aJohb.

The housing 3 is also provided with tension members 12 on both sides of the optical unit 2

2, which are in the same line S2 as the optical unit 2. For example, the optical unit 2 is in the longitudinal direction; viewed from the center of the housing 3, and the center of each fossil member 12 is on a line S2 passing through the center of the optical member 2. The test elements 12 serve to control the direction in which the fiber optic cable 1 is bent.

In addition, the cover 3 is provided with release papers 13 for easy separation of the optical unit 2 from the fiber optic cable I when the cover 3 is a. 1. Starting from the incisions I split. The release papers 13 are arranged parallel to the same line S2, along which are located the edges of the optical unit 2 and the tensioner 12, and are arranged on the upper and lower sides to enclose the

2 optical units. Preferably, the deposited release papers 13 extend to at least the lines S1 that connect the incisions 11 on the upper and lower sides.

- with each other to prevent the optical unit 2 from being damaged by the cutting eyes used to break the cover 3 into the slots 11,

The release papers 13 extending in the longitudinal direction of the fiber optic cable 1 are made of flat plastic tape or PET film and have sufficient length in the right-to-fish direction to reach the right and left tensile metals 12. In this example, the upper and lower release papers 13 are in contact with each other with the optical unit 2. The release papers 13 are disposed within the cover 3 but are not secured to the cover 3 when the cover 3 is cut.

In order to remove the optical unit 2 from the fiber optic cable I formed as described above, a cutting tool is brought into contact with one of the four notches 11 and then moved longitudinally. After the incisions 11 have been cut, the incisions in the incisions 11 gradually extend towards the inside of the fiber optic cable 1 and reach the release papers 13, here the arrangement of the release pairs 13 allows the optical unit 2 to be protected by the cutting tool! sacred, without being injured. In addition, the optical unit 2 is not a pair of notches 11 facing each other on the upper and lower sides. interconnecting SI line d, which also prevents the optical unit 2 from being damaged.

When the cover 3 is pulled from both sides so that the two tensioning members 12 are separated from one another, the cover 3 can be disassembled into four separate parts as shown in FIG. Since the release papers 13 do not essentially adhere to the cover 3, the release papers 13 can be easily removed from the cover 3 after the cover 3 has been broken, and the buso optical unit 2 can be properly removed without the need for splitting the cover 3. to die by force. In addition, the optical unit 2 is coated with a layer 4 of cylindrical shape so that the inner optical fibers 5 do not deflect therefrom, even when the cover 3 has been opened, so that layer 4 of the optical unit 2 can be opened, so that we can take out the 5 light-guide strands we picked out of it.

As described above, the fiber optic cable 1 of the present embodiment has a structure such that inside the cylindrical layer 4 the optical unit 2 receiving the optical fiber 5 is covered by the housing 3, so that the optical unit 2 can be completely removed while in the case of the inner fiber 5, it is prevented from being protruded from it, even if the notches 1 1 are cut or scratched to fold the cover 3. If the fiber 5 is covered only by the cover 3,. the fiber-optic filaments could escape from it when the casing 3 was ruptured due to the force applied to it, or the casing 3 could adhere to the photoconductor 5

And to the fibers so that they would suddenly fold,

Since the layer 4 surrounds the optical unit 2, the optical fibers 5 are not in direct contact with the housing 3, so that the optical unit 2 can be easily removed from the housing 3 and the optical fibers 5 can be easily removed from the optical unit 2. reduces the risk of transmission loss in cable bending or heat removal. Accordingly, the fiber optic cable 1 according to the present embodiment can also be readily carried out in the intermediate branching without the need for sudden strong drives in the fiber-optic fibers 5.

According to a fiber optic cable of the winter embodiment, the release papers 13 are located on the upper and lower sides of the optical unit 2 and surround the optical unit 2, and the optical unit 2 is not a pair of incision pairs 11 formed on the upper and lower sides line. As a result, the optical unit 2 does not: it may be damaged by the tool cutting the pavement path 3.

In the case of the fiber optic cable 1 according to the present embodiment, since the release papers 13 are in contact with the optical unit 2, the cover 3 cannot be placed between the optical unit 2 and the optical unit 2.

13, so that the optical unit 2 can be removed without having to apply force to it.

Although the optical unit 2 is in contact with the release papers 13 shown in Figure 1, there may be small gaps between them. If the gaps are not large, the optical unit 2 can be removed without difficulty as the casing 3 is thin.

With respect to the fiber optic cable 1 according to the present invention, the following numerals 1-4 were prepared and subjected to an intermediate branching test and temperature curve test. For the fiber optic cable 1, the numbered pattern 1 is a twisted strip of four strands of four strands of the structure shown in FIG.

Table 1 shows the result of the intermediate branching ability and temperature curve test. There is no separating paper in the 2-numbered pattern, in the 3-numbered pattern

-8 there is no layer of light-guide fiber and the numbering of the 4-numbered fiber is such that the optical unit is located between a pair of incisions facing each other on the top and bottom of the cover.

UaMázat

.1. sample 2, pattern 3, sample 4, sample Separating paper there is no there is there is Layer of optical unit bow-wow there is mnes there is , 4 incisions located The optical unit is not a notched pair common The optical unit there is no a incision pair between The optical unit is not a incision pair between The optical unit a incision pair is between The temperature curve results She She X She Intermediate branching ability She X X X

The temperature characteristic test was performed in such a manner that the individual samples "was held low and high temperatures C for six hours and assayed in each sample of the transmission loss and the substantial loss cables with no change" 30 ^Ti C and 7i) p "symbol, and the loss adjusting cables are marked with an "x". The intermediate branching grid was performed by cutting the slits and pulling the pins in the longitudinal direction of the cable to determine whether the built-in optical unit could be removed. pull out of the slit casing at the incisions, and a cable with no significant loss is labeled "A *" and a cable with variable loss is labeled "x",

Samples # 1, # 2 and # 4 did not show a large increase in loss over the temperature curve; the 3-digit unnia, where the optical unit was not surrounded by a cylindrical layer, however, showed an increase in loss. This is due to the fact that there may have been light conductive fibers embedded in the housing and, as a result, *

they were unable to move when the cable contracted or stretched due to temperature change; that the fiber-optic filaments were distorted locally and this caused an increase in loss,

In the intermediate branching test, only the sample numbered 1 could be covered so that no hearing in the light-guide fibers would immediately pass. In the 2-numbered sample, some of the conductive fibers were drawn from the layer surrounding the optical unit when the casing was opened at the incisions and subsequent operations were difficult. In particular, there was a risk that the protruding, glowing fibers were accidentally cut when the casing was split,

In the 3-numbered sample, because of the presence of some fiber in the housing, there was a sudden hair defect in these fiber which caused a great loss of change. In addition, the tape was intermittent between adjacent fiber. The connecting portions were also separated because some of the fiber-optic filaments were pulled together with the braided casing and therefore separated from the other fiber-optic filaments. As a result, the arrangement of the tapes could not be figured out and the tapes could not be distinguished. In the 4-numbered sample, a cutting tool was inserted into the optical unit when the casing was cut, leading to a split of the fiber optic fibers.

Xkmteúalók

Embodiment 2 is a structure in which a plurality of optical units 2 are aligned within a single housing and a structure in which the plurality of optical units 2 are arranged in rows in a vertical direction. Yeah. FIG. 3B shows a structure in which three optical units 2 are aligned side by side in a single row S2. The release papers 13 are in contact with each of the three optical units 2 or are arranged with small gaps between them. Fig. 7 shows a construction in which a triple optical unit 2 is aligned side by side in an upper row and a lower row. The top and bottom aligned triple optical units 2 are vertically aligned to the right hehv / Udntk eh

The fiber optic cable 1 or the fiber optic cable 1 shown in FIG

The units 3 can be easily removed from the housing 3 and the fiber-optic fibers 5 can also be easily removed from the optical units 2 because the fiber-optic cable is of the construction shown in FIG. Individual configurations reduce the risk of loss of change due to cable bending or thermal change, so that there is no excessive bending of the fiber when the fiber is removed.

Ikiyifeliuiak

Embodiment 3 is an example of a fiber optic cable shown in Fig. 8, which is provided with a portion 15 which is connected to it through a neck portion 14. An element part 16 in which the optical unit 2 is covered by a cover 3 has the same structure as the fiber optic cable shown in FIG. includes in the middle, which is in the same line, my way to the optical unit 2 and the 12 hönerel. The element portion 16 may be loosely coupled to the holding wire portion 15.

In the case of a fiber optic cable with a support wire portion 15, the optical unit 2 can be easily separated from the housing 3 and the optical fibers 5 can be easily removed from the optical unit 2, just as the fiber optic cable shown in FIG. it only engages with the neck portion 14. This design reduces loss modification when the cable is bent or the temperature is changed so that there is no excessive drive in the light conductive filaments when the light conductive filaments are removed.

The present invention relates to a fiber optic cable having a fiber optic cable covered with a four-angled cross-section, the optical unit having a pine conductive fiber inside it extends within a cylindrical layer so that the ends of the layer overlap,

References, signs:

fiber optic cable optical unit housing 3a wall surface

3b wall surface layer *

End 4a and 4b 5 fiber optic filaments 5A-5D fiber optic filament interconnecting filament filament layer layer incision tensioner

13 Separation Paper Neck Bracket Wire Part A Spout Brace Element Part IS P Distance Line Line X Arrow ¥ Arrow

Claims (5)

.1, a fiber optic cable comprising an optical unit covered with a rectangular cross-section, wherein the cylindrical optical unit comprises fiber-optic fibers inside a layer so that the ends (4a, 4b) of the layer (4) overlap each other on the housing. (3) tensioning elements (12) are arranged on both sides of the optic unit (2) in line with it (S2), and release papers (13) facilitating its removal from the optical unit (2) are arranged on its upper and lower sides. the release papers (13) with the line (S2) along which the optical unit (2) and the tension members <12 »are arranged parallel to the optical unit (2), the top and bottom of the cover <3) the optical unit (2) is arranged asymmetrically on the line (S1) connecting the incision pairs (II) facing each other on the upper and lower sides. Fiber optic cable according to claim 1, characterized in that the release papers (13) are in contact with the optical unit (2). Fiber optic cable according to claim 1 or 2, characterized in that it is a factual fiber. (5) is formed by intermittent bonding of the tape so that the optical fibers (5) are arranged parallel to each other, each of the adjacent optical fibers (5) being interconnected by a plurality of connecting portions (?) Arranged longitudinally and widthwise of the tape. 4. Fiber optic cable according to any one of claims 1 to 5, characterized in that more than one optical unit (2) is arranged in a single line or in multiple lines in the vertical direction. 5 »Procedure 1-4. A fiber optic cable according to any one of claims 1 to 8, for separating the optical unit, uzzaffe / fe / wva, splitting the housing (3) from the incisions (11), separating its tensioning elements (12) and separating papers 30 (13), separating the inner optical unit by releasing it.