Rollable optical fiber ribbon and manufacturing method therefor

Abstract

The present invention relates to a rollable optical fiber ribbon and a manufacturing method therefor, wherein: the arrangement of multiple joining parts for joining adjacent optical fibers constituting a rollable optical fiber ribbon is optimized to provide sufficient joining strength between the adjacent optical fibers, so as to prevent separation of optical fibers during widthwise rolling of the optical fiber ribbon; in the process of spraying resin for forming joining parts, the joining parts neighboring in the width direction of the optical fiber ribbon are prevented from being unintentionally connected to each other by the joining resin to deteriorate the flexibility thereof, so that widthwise rolling of the optical fiber ribbon is facilitated; and damage to the optical fibers can be prevented in the process of separating a specific optical fiber in order to achieve optical connection.

Description

Rollable optical fiber ribbon and method for manufacturing the same

[0001] The present invention relates to a rollable optical fiber ribbon and a method for manufacturing the same. More specifically, the present invention relates to a rollable optical fiber ribbon and a method for manufacturing the same, which optimizes the arrangement of a plurality of joints that join adjacent optical fibers constituting the rollable optical fiber ribbon, thereby providing sufficient bonding strength between adjacent optical fibers to prevent separation of optical fibers during a widthwise rolling process of the optical fiber ribbon, and which prevents a phenomenon in which adjacent joints in the widthwise direction of the optical fiber ribbon are unintentionally connected to the bonding resin during a resin spraying process for forming joints, thereby reducing flexibility, thereby facilitating widthwise rolling of the optical fiber ribbon, and which prevents damage to the optical fibers during a process of separating specific optical fibers for optical connection.

[0002] An optical fiber ribbon is a composite material made by joining multiple optical fibers in parallel at a joint, and is generally manufactured in the form of a strip. These are also laminated to form a ribbon laminate in the shape of a polygonal column.

[0003] Optical fiber ribbons are mainly used in large-capacity communication networks because of their advantage of being able to be connected in bulk by fiber ribbon at the connection point.

[0004] When multiple tubes (or microtubes) are pre-installed within a conduit for the construction of an optical communication network, and strip-shaped optical fiber ribbons or multi-column-shaped optical fiber ribbon stacks are laid within tubes, which are primarily circular in cross-section, the internal space of the tubes installed within the conduit is not highly usable. Furthermore, it is desirable for an optical cable or optical unit to accommodate a greater number of fiber cores per the same cross-sectional area.

[0005] In order to increase the usability of the internal space of a tube installed in a conduit for constructing an optical communication network or the number of optical fiber cores accommodated in an optical cable or optical unit, a rollable optical fiber ribbon that can be accommodated by rolling the optical fiber ribbon in the width direction and transforming it into a cylindrical shape, etc., is being introduced.

[0006] Such a rollable optical fiber ribbon must maintain the shape of the optical fiber ribbon so that the spliced ​​optical fibers are not easily separated when rolled in the width direction constituting the optical fiber ribbon, and when the rolled state is released at the connection end, it must return to the shape of a general strip-shaped optical fiber ribbon so that bulk splicing is possible. In addition, when individual optical fibers must be separated during the splicing process, the work of separating individual optical fibers must be easy and the optical fibers must be prevented from being damaged during the separation process. Various conditions must be satisfied.

[0007] To this end, there have been many efforts and attempts to manufacture a rollable optical fiber ribbon that can roll in the width direction while preventing separation or damage to the optical fiber by combining and using a specific joint pattern formed according to a pattern rule such as a predetermined period or interval in the width direction or length direction of the optical fiber ribbon.

[0008] In addition, a plurality of joints can be formed by a method in which a jointing resin is simultaneously or continuously sprayed onto the surface of an optical fiber ribbon from a plurality of spray nozzles provided in a dispenser or the like.

[0009] Meanwhile, when the joints are placed close together in the width direction of the optical fiber ribbon during joint formation, the resin for joint formation is sprayed, and the adjacent joints in the width direction of the optical fiber ribbon are unintentionally connected to the joint resin, which causes the joints to be connected. As a result, the flexibility of the optical fiber ribbon in the width direction is reduced, so that the width direction rolling is not easy, and the branching of a specific optical fiber for optical connection at the connection end is difficult, which causes the optical fiber to be damaged.

[0010] Accordingly, there is a great demand for a rollable optical fiber ribbon and a method for manufacturing the same, which can prevent separation of optical fibers during the widthwise rolling process of the optical fiber ribbon by optimizing the arrangement of a plurality of joints that joint adjacent optical fibers constituting the rollable optical fiber ribbon, thereby sufficiently joining the optical fibers by the joints, and which can prevent a phenomenon in which adjacent joints in the widthwise direction of the optical fiber ribbon are unintentionally connected by the joint resin during the resin spraying process for forming the joints, thereby reducing flexibility.

[0011] The present invention aims to provide a rollable optical fiber ribbon and a method for manufacturing the same, which optimizes the arrangement of a plurality of joints that joint adjacent optical fibers constituting a rollable optical fiber ribbon, thereby providing sufficient joint strength between adjacent optical fibers to prevent separation of optical fibers during a widthwise rolling process of the optical fiber ribbon, and which prevents a phenomenon in which adjacent joints in the widthwise direction of the optical fiber ribbon are unintentionally connected to the joint resin during a resin spraying process for forming joints, thereby reducing flexibility, thereby facilitating widthwise rolling of the optical fiber ribbon, and which prevents damage to the optical fiber during a process of separating a specific optical fiber for optical connection.

[0012] In order to solve the above problem, the present invention provides a rollable optical fiber ribbon capable of rolling in the width direction, comprising: a plurality of optical fibers arranged in parallel in the length direction; and a plurality of joints spaced apart in the length direction of the ribbon and joining a pair of adjacent optical fibers among the plurality of optical fibers, wherein the plurality of joints are arranged at corresponding positions in the width direction of the optical fiber ribbon, and three or more of the optical fibers are arranged between two joints adjacent in the width direction of the optical fiber ribbon, and the separation distance (W) between two joints adjacent in the width direction of the optical fiber ribbon G ) is 360 micrometers (μm) to 1120 micrometers (μm), and the width (W) of the joint B ) is the outer diameter (D) of the optical fiberF ) can be provided. A rollable optical fiber ribbon characterized by having a diameter less than twice that of the fiber.

[0013] In addition, the length of the above joint (L B ) can be from 5 millimeters (mm) to 18 millimeters (mm).

[0014] And, the longitudinal separation distance (L) of the optical fiber ribbons between the joint that joins the nth optical fiber (n is a natural number greater than or equal to 1) and the n+1th optical fiber among the plurality of optical fibers and the joint that joins the n+1th optical fiber and the n+2nd optical fiber G ) can be from 3 millimeters (mm) to 15 millimeters (mm).

[0015] Here, the longitudinal separation distance (L) of the optical fiber ribbon of the above joint G ) for the above joint length (L) B ) of the ratio (L) G / L B ) can be 0.4 to 2.

[0016] In this case, the longitudinal separation distance (L) of the optical fiber ribbon of the above joint G ) is the length of the above joint (L B ) may be less than or equal to.

[0017] And, the unjoined length (L), which is the shortest distance between two adjacent joints among the multiple joints that join a pair of adjacent optical fibers, N ) can be 30 millimeters (mm) to 70 millimeters (mm).

[0018] In addition, the non-joint length (L) N ) for the above joint length (L) B ) of the ratio (L) N / L B ) can be 2 to 10.

[0019] And, the longitudinal period (P) of the joint can be 24 millimeters (mm) to 84 millimeters (mm).

[0020] Here, the spacing distance (W) between two adjacent joints in the width direction of the optical fiber ribbon G ) can be from 360 micrometers (μm) to 835 micrometers (μm).

[0021] In this case, the joint can be formed by applying a UV-curable resin between adjacent pairs of optical fibers and then curing the applied resin.

[0022] And, the elongation after hardening of the joint may be 80% to 220%, the tensile strength may be 7 MPa to 21 MPa, and the elastic cross modulus may be 30 MPa to 90 MPa at 2.5% strain.

[0023] In addition, the viscosity of the resin constituting the above joint is 150 mPa·s to 440 mPa·s at 30°C, and the density is 0.52 g / cm at 23°C. 3 1.73 g / cm 3 It could be.

[0024] In addition, the positions of the optical fiber ribbon width direction of the joint that joins the nth optical fiber (n is a natural number greater than or equal to 1) and the n+1th optical fiber among a plurality of optical fibers, the joint that joins the n+1th optical fiber and the n+2nd optical fiber, and the joint that joins the n+2nd optical fiber and the n+3rd optical fiber may not all correspond.

[0025] Here, the longitudinal positions of the optical fiber ribbons of the joints that join the nth optical fiber (n is a natural number greater than or equal to 1) and the n+1th optical fiber among a plurality of optical fibers and the joints that join the n+3rd optical fiber and the n+4th optical fiber may correspond.

[0026] In this case, the widthwise positions of the optical fiber ribbons of the joints that join the n+3rd optical fiber and the n+4th optical fiber among the plurality of optical fibers do not correspond, but the lengthwise positions of the optical fiber ribbons of the joints that join the nth optical fiber and the n+1st optical fiber among the plurality of optical fibers and the joints that join the n+4th optical fiber and the n+5th optical fiber among the plurality of optical fibers may correspond.

[0027] In this case, the width of the joint (W B ) is the outer diameter (D) of the optical fiber F ) may be less than 1.6 times.

[0028] In addition, in order to solve the above problem, the present invention can provide a method for manufacturing a rollable optical fiber ribbon, characterized in that it comprises the steps of: arranging a plurality of optical fibers in parallel; transporting the plurality of optical fibers arranged in parallel at a linear speed of 50 m / min to 1000 m / min; spraying a resin between the plurality of optical fibers transported from a plurality of dispenser nozzles spaced apart in the width direction of the optical fiber ribbon; and forming a plurality of joints by UV curing the sprayed resin.

[0029] In addition, the plurality of dispensers may be configured as a plurality of dispenser sets including one or more dispensers, each dispenser set being spaced apart at different positions in the longitudinal direction of the optical fiber ribbon, and each dispenser included in one dispenser set may be spaced apart in the width direction at positions corresponding to the longitudinal direction of the optical fiber ribbon.

[0030] Additionally, resin can be sprayed simultaneously from the dispenser nozzles of all dispensers.

[0031] Here, the number of the above dispenser sets may be three or more.

[0032] According to the rollable optical fiber ribbon and the manufacturing method thereof according to the present invention, a dispenser nozzle for spraying a bonding resin is arranged so that the distance between two adjacent joints in the width direction of the optical fiber ribbon is in the range of 360 micrometers (μm) to 1120 micrometers (μm), preferably 360 micrometers (μm) to 835 micrometers (μm), thereby providing sufficient bonding force between adjacent optical fibers, thereby preventing separation of optical fibers during the width direction rolling process of the optical fiber ribbon.

[0033] In addition, according to the rollable optical fiber ribbon and the manufacturing method thereof according to the present invention, during the resin spraying process for forming a joint, the phenomenon of unintentionally connecting adjacent joints in the width direction of the optical fiber ribbon with the joint resin, thereby reducing flexibility, is prevented, thereby facilitating the width direction rolling of the optical fiber ribbon, and when a specific optical fiber is separated from the optical fiber ribbon for optical connection, damage to the optical fiber can be prevented.

[0034] FIG. 1 illustrates one embodiment of a rollable optical fiber ribbon according to the present invention in a state of being rolled in the width direction.

[0035] FIG. 2 illustrates a plan view of one embodiment of a rollable optical fiber ribbon according to the present invention.

[0036] FIG. 3 is a reference drawing for explaining the arrangement shape of a plurality of joints constituting a rollable optical fiber ribbon according to the present invention.

[0037] FIG. 4 illustrates a plan view of another embodiment of a rollable optical fiber ribbon according to the present invention.

[0038] FIGS. 5 to 7 illustrate plan views of various embodiments according to the joint shape of the rollable optical fiber ribbon according to the present invention.

[0039] FIG. 8 illustrates an enlarged cross-sectional view of one embodiment of a rollable optical fiber ribbon according to the present invention.

[0040] FIG. 9 illustrates an enlarged cross-sectional view of another embodiment of a rollable optical fiber ribbon according to the present invention.

[0041] FIG. 10 illustrates an enlarged cross-sectional view of another embodiment of an optical fiber ribbon according to the present invention.

[0042] FIG. 11 illustrates an enlarged cross-sectional view of another embodiment of a rollable optical fiber ribbon according to the present invention.

[0043] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided to ensure that the disclosure is thorough and complete, and to sufficiently convey the spirit of the invention to those skilled in the art. Like reference numbers designate like elements throughout the specification.

[0044] FIG. 1 illustrates one embodiment of an optical fiber ribbon (100) according to the present invention in a state of being rolled in the width direction, and FIG. 2 illustrates a plan view of one embodiment of a rollable optical fiber ribbon (100) according to the present invention.

[0045] As illustrated in FIG. 1, a rollable optical fiber ribbon (100) according to the present invention may be configured in a state in which a plurality of optical fibers are joined in parallel through a plurality of joints (20) and rolled in the width direction. Each optical fiber (10) constituting the rollable optical fiber ribbon (100) may have an outer diameter in the range of 180 micrometers (μm) to 265 micrometers (μm), and the optical fiber (10) may be configured to include a core (11), a cladding layer (12), a coating layer (13), and a coloring layer (14).

[0046] The above core (11) may be composed of glass or synthetic resin and transmits light. The clad layer (12) may be formed to surround the outer surface of the core (11).

[0047] The above cladding layer (12) uses glass or synthetic resin made of silica material having a relatively lower refractive index than the core (11), thereby transmitting a signal by causing total reflection of light passing through the center of the optical fiber (10).

[0048] The above coating layer (13) may be formed by coating the surface of the clad layer (12) with a material including at least one of acrylate, polyimide, and carbon. The coating layer (13) is formed to surround the outer circumferential surface of the clad layer (12) and absorbs external impact transmitted to the clad layer (12). The coating layer (13) may be composed of a plurality of layers having different physical properties, such as modulus, in order to protect internal components.

[0049] The rollable optical fiber ribbon (100) according to the present invention is configured to be rollable in the width direction, and each optical fiber (10) constituting the rollable optical fiber ribbon (100) may include a coloring layer (14) in the outermost layer.

[0050] The above coloring layer (14) is a coating material containing a coloring agent such as a colored or colorless pigment, which is applied to the surface of the coating layer (13) to impart color to the optical fiber (10), thereby enabling identification through color from other optical fibers.

[0051] In this way, the rollable optical fiber ribbon (100) can join adjacent optical fibers by forming joints, and if the bonding strength of the joints is too small, for example, if the number of joints is too small or the length of the joints is short, the optical fibers are too easily separated during the rolling process of the optical fiber ribbon, making it difficult to maintain a rolling state, and if the bonding strength is too large, for example, if there are too many joints or adjacent joints are connected to each other with resin, the flexibility is insufficient, making rolling difficult, and the optical fibers may be damaged during the process of branching individual optical fibers for connection at the end.

[0052] Accordingly, the present invention solves the aforementioned problem by optimizing the arrangement of a plurality of joints that join adjacent optical fibers forming a rollable optical fiber ribbon. This will be described in detail with reference to FIG. 2 and below.

[0053] As shown in FIG. 2, the rollable optical fiber ribbon (100) according to the present invention is provided with a plurality of optical fibers (10) arranged in parallel, and a pair of adjacent optical fibers (10) among the plurality of optical fibers (10) are joined through a plurality of joints (20) spaced apart in the longitudinal direction of the optical fiber ribbon, and the distance (W) between two adjacent joints (20) among the plurality of joints (20) in the width direction of the optical fiber ribbon G ) may range from 360 micrometers (μm) to 1120 micrometers (μm), preferably from 360 micrometers (μm) to 835 micrometers (μm).

[0054] The above-mentioned rollable optical fiber ribbon (100) can be configured by joining a pair of optical fibers (10) arranged adjacently among a plurality of optical fibers (10) arranged in parallel through a plurality of joints (20) having a specific pattern along the length direction of the optical fiber ribbon.

[0055] Here, a plurality of optical fibers (10) constituting a rollable optical fiber ribbon (100) can be joined in parallel in a state where a pair of optical fibers (10) are externally connected or slightly spaced apart from each other and are adjacent to each other by a joint (20), and the joint (20) can be arranged in a certain area in the circumferential direction of the optical fiber (10).

[0056] The rollable optical fiber ribbon (100) according to the present invention combines a specific joint pattern formed according to a predetermined pattern rule with a plurality of joints (20) in the width direction of the optical fiber ribbon or the length direction of the optical fiber ribbon, thereby enabling width-wise rolling while preventing separation of the optical fiber (10) or damage to the optical fiber (10) during the rolling process.

[0057] Here, the width direction of the optical fiber ribbon means the vertical direction of the optical fiber ribbon (100) based on the drawing shown in FIG. 2, and the length direction of the optical fiber ribbon means the direction in which the optical fiber (10) extends long, i.e., the horizontal direction.

[0058] In addition, the joint (20) of the rollable optical fiber ribbon (100) according to the present invention can be formed by a method of spraying and curing a jointing resin between adjacent optical fibers from a plurality of dispenser nozzles arranged at predetermined positions.

[0059] Meanwhile, when a pair of joints (20) adjacent to each other in the width direction of the optical fiber ribbon (100) during the formation of a joint of a rollable optical fiber ribbon (100) is too close, the adjacent joints may be connected by the joint resin that is sprayed in the width direction of the optical fiber ribbon (100) during the resin spraying process, and accordingly, flexibility is reduced in the area where the joints are connected by the joint resin, making it difficult to roll the optical fiber ribbon (100) in the width direction, and the joint (20) may be formed unnecessarily large or the joint force may be excessive, which may cause damage to the optical fiber (10) during branching work at the connection or branching end.

[0060] Accordingly, the rollable optical fiber ribbon (100) according to the present invention includes a plurality of joints (20) for joining a pair of adjacent optical fibers (10), and the distance (W) between two adjacent joints (20) among the plurality of joints (20) formed in the width direction of the optical fiber ribbon G ) was configured in the range of 360 micrometers (μm) to 1120 micrometers (μm), preferably 360 micrometers (μm) to 835 micrometers (μm).

[0061] That is, the rollable optical fiber ribbon (100) according to the present invention forms a specific joint pattern with a plurality of joints (20) as described below, and the distance between two adjacent joints (20) among the plurality of joints formed at corresponding positions in the width direction of the optical fiber ribbon is (W). G ) is secured sufficiently large, and the width (W) of the joint (20) B ) is the outer diameter (D) of the optical fiber included in the above-mentioned rollable optical fiber ribbon (100). F ) can be made smaller than twice the bonding area, thereby preventing the phenomenon of different bonding areas (20) being attached to each other during bonding or more than two continuous adjacent optical fibers being connected by one bonding area (20).

[0062] More preferably, the width (W) of the joint (20) B ) is the outer diameter (D) of the optical fiber included in the above-mentioned rollable optical fiber ribbon (100). F ) is made smaller than 1.6 times the width (W) of the joint (20) generated in the manufacturing process of the rollable optical fiber ribbon (100). B ) can secure a stable structure by securing a margin that takes into account the deviation.

[0063] Referring to the reference drawing of FIG. 3, the arrangement shape of the plurality of joints (20) constituting the rollable optical fiber ribbon (100) according to the present invention will be described in more detail.

[0064] Figure 3 is an example of various arrangement shapes of four joints arranged in the width direction of a rollable optical fiber ribbon.

[0065] The rollable optical fiber ribbon (100) according to the present invention is formed with a plurality of joints (20) at corresponding positions in the width direction of the optical fiber ribbon, and the distance (W) between two adjacent joints (20) among the plurality of joints (20) in the width direction of the optical fiber ribbon G ) can secure a certain distance range.

[0066] Here, the phrase "a plurality of joints (20) are arranged at corresponding positions" means a configuration in which a plurality of joints (20) are arranged at positions in which at least a portion of the joints (20) overlap in the longitudinal direction of the optical fiber ribbon. That is, in FIG. 3, the positions of three joints (20a, 20b, 20c) correspond to each other, but one joint (20d) does not correspond.

[0067] In addition, the fact that two joints (20) are 'adjacent' means a shape in which a plurality of joints (20a, 20b, 20c) are arranged adjacently at corresponding positions as described above. That is, in FIG. 3, the joint adjacent to the joint (20a) that joins the second and third optical fibers is the joint (20b) that joins the fifth and sixth optical fibers, and the joint adjacent to the joint (20b) that joins the fifth and sixth optical fibers is the joint (20c) that joins the eighth and ninth optical fibers.

[0068] Based on the embodiment shown in Fig. 2, the length of the straight line connecting the lowest part of the joint (20) provided at the top in the optical fiber ribbon width direction and the uppermost part of the joint (20) provided at the bottom in the optical fiber ribbon width direction among two adjacent joints in the optical fiber ribbon width direction is the separation distance (W). G ) can be defined as.

[0069] As illustrated in FIG. 2, a rollable optical fiber ribbon (100) according to the present invention may have at least three optical fibers (10) provided between two adjacent joints (20) among a plurality of joints (20) formed in the width direction of the optical fiber ribbon at any position in the length direction of the optical fiber ribbon.

[0070] In the case where a rollable optical fiber ribbon (100) according to the present invention has three optical fibers (10) provided between two adjacent joints (20) in the width direction of the optical fiber ribbon as illustrated in FIG. 2, the joint (20) that joins the nth (n is a natural number greater than or equal to 1) optical fiber (10) and the n+1th optical fiber (10), the joint (20) that joins the n+1th optical fiber (10) and the n+2nd optical fiber (10), and the joint (20) that joins the n+2nd optical fiber (10) and the n+3rd optical fiber (10) can be formed in a diagonal direction or a step-like pattern.

[0071] In this case, as illustrated in FIG. 2, the longitudinal positions of the optical fiber ribbon of the joint (20) that joins the nth (n is a natural number greater than or equal to 1) optical fiber (10) and the n+1th optical fiber (10) among a plurality of optical fibers (10), the longitudinal positions of the optical fiber ribbon of the joint (20) that joins the n+1th optical fiber (10) and the n+2nd optical fiber (10), and the longitudinal positions of the optical fiber ribbon of the joint (20) that joins the n+2nd optical fiber (10) and the n+3rd optical fiber (10) may all be configured not to correspond.

[0072] For example, the rollable optical fiber ribbon (100) of the embodiment illustrated in FIG. 2 is composed of 12 optical fibers (10), and the longitudinal positions of the optical fiber ribbons for the joint (20) that joins the 1st (n, n=1)th optical fiber (10(1)) and the 2nd (n+1)th optical fiber (10(2)), the joint (20) that joins the 2nd (n+1)th optical fiber (10(2)) and the 3rd (n+2)th optical fiber (10(3)), and the joint (20) that joins the 3rd (n+2)th optical fiber (10(3)) and the 4th (n+3)th optical fiber (10(4)) may all be configured not to correspond.

[0073] Furthermore, among the plurality of optical fibers (10) constituting the optical fiber ribbon (100), the longitudinal position of the optical fiber ribbon of the joint (20) that joins the n+1-th optical fiber (10) and the n+2-th optical fiber (10) is configured to be arranged at a corresponding position of the longitudinal position of the optical fiber ribbon of the joint (20) that joins the n-th optical fiber (10) and the n+1-th optical fiber (10) and the longitudinal position of the optical fiber ribbon of the joint (20) that joins the n+2-th optical fiber (10) and the n+3-th optical fiber (10), so that the spacing between adjacent joints (20) in the width direction of the optical fiber ribbon (100) can be made uniform, and accordingly, uniform width-direction flexibility can be secured in the entire longitudinal position of the optical fiber ribbon (100).

[0074] In addition, the rollable optical fiber ribbon (100) according to the present invention can be configured so that the longitudinal positions of the optical fiber ribbon of the plurality of joints (20) periodically formed in the width direction of the optical fiber ribbon correspond to each other.

[0075]

[0076] *Specifically, the longitudinal position of the optical fiber ribbon of the joint (20) that joins the nth (n is a natural number greater than or equal to 1)th optical fiber (10) and the n+1th optical fiber (10) among a plurality of optical fibers (10) and the longitudinal position of the optical fiber ribbon of the joint (20) that joins the n+3rd optical fiber (10) and the n+4th optical fiber (10) can be configured to correspond.

[0077] For example, among the 12 optical fibers (10) constituting the rollable optical fiber ribbon (100) of the embodiment illustrated in FIG. 2, the longitudinal positions of the optical fiber ribbon with respect to the joint (20) that joins the 1st (n, n=1) optical fiber (10(1)) and the 2nd optical fiber (10(2)), the joint (20) that joins the 4th optical fiber (10(2)) and the 5th optical fiber (10(3)), the joint (20) that joins the 7th optical fiber (10(7)) and the 8th optical fiber (10(8)), and the joint (20) that joins the 10th optical fiber (10) and the 11th optical fiber (10) are all configured to correspond to each other so that the optical fiber ribbon can be formed substantially in a straight line in the optical fiber width direction.

[0078] FIG. 4 illustrates a plan view of another embodiment of a rollable optical fiber ribbon according to the present invention.

[0079] Specifically, FIG. 4 illustrates an embodiment in which four optical fibers (10) are arranged between two adjacent joints (20) in the width direction of the optical fiber ribbon among the rollable optical fiber ribbons (100) according to the present invention.

[0080] The rollable optical fiber ribbon (100) illustrated in FIG. 4 has four optical fibers (10) arranged between two adjacent joints (20) in the width direction of the optical fiber ribbon, so the distance (W) between the two adjacent joints (20) is shorter than when three optical fibers (10) are arranged between two adjacent joints (20) as in FIG. 2. G ) is formed larger, effectively preventing the phenomenon of mutual bonding between joints, and has the effect of further improving flexibility in the width direction of the optical fiber ribbon.

[0081] In the case where a rollable optical fiber ribbon (100) according to the present invention has four optical fibers (10) provided between two adjacent joints (20) in the width direction of the optical fiber ribbon as illustrated in FIG. 4, the joints (20) for joining the nth (n is a natural number greater than or equal to 1) optical fiber (10) and the n+1th optical fiber (10), the joints (20) for joining the n+1th optical fiber (10) and the n+2nd optical fiber (10), the joints (20) for joining the n+2nd optical fiber (10) and the n+3rd optical fiber (10), and the joints (20) for joining the n+3rd optical fiber (10) and the n+4th optical fiber (10) can be formed in a diagonal direction or a step-like pattern.

[0082] In this case, as illustrated in FIG. 4, the longitudinal position of the optical fiber ribbon of the joint (20) that joins the nth (n is a natural number greater than or equal to 1) optical fiber (10) and the n+1th optical fiber (10) among a plurality of optical fibers (10), the longitudinal position of the optical fiber ribbon of the joint (20) that joins the n+1th optical fiber (10) and the n+2nd optical fiber (10), the longitudinal position of the optical fiber ribbon of the joint (20) that joins the n+2nd optical fiber (10) and the n+3rd optical fiber (10), and the longitudinal position of the optical fiber ribbon of the joint (20) that joins the n+3rd optical fiber (10) and the n+4th optical fiber (10) may all be configured not to correspond.

[0083] For example, the rollable optical fiber ribbon (100) of the embodiment illustrated in FIG. 4 is composed of 12 optical fibers (10), and the longitudinal positions of the optical fiber ribbons for the joint (20) that joins the 1st (n, n=1)th optical fiber (10(1)) and the 2nd (n+1)th optical fiber (10(2)), the joint (20) that joins the 2nd (n+1)th optical fiber (10(2)) and the 3rd (n+2)th optical fiber (10(3)), the joint (20) that joins the 3rd (n+2)th optical fiber (10(3)) and the 4th (n+3)th optical fiber (10(4)), and the joint (20) that joins the 4th (n+3)th optical fiber (10(4)) and the 5th (n+4)th optical fiber (10(5)) may not all correspond.

[0084] Furthermore, among the plurality of optical fibers (10) constituting the optical fiber ribbon (100), the longitudinal position of the optical fiber ribbon of the joint (20) that joins the nth optical fiber (10) and the n+1th optical fiber (10), the longitudinal position of the optical fiber ribbon of the joint (20) that joins the n+1th optical fiber (10) and the n+2nd optical fiber (10), the longitudinal position of the optical fiber ribbon of the joint (20) that joins the n+3rd optical fiber (10) and the n+4th optical fiber (10), and the longitudinal position of the optical fiber ribbon of the joint (20) that joins the n+4th optical fiber (10) and the n+5th optical fiber (10) are configured to be spaced apart from each other by the same interval, so that the interval between adjacent joints (20) in the width direction of the optical fiber ribbon (100) can be made uniform, and accordingly, uniform width-direction flexibility can be secured in the entire longitudinal position of the optical fiber ribbon (100).

[0085] As in the embodiment illustrated in FIG. 2, the rollable optical fiber ribbon (100) according to the present invention can be configured so that the longitudinal positions of the optical fiber ribbon of the four joints (20) periodically formed in the width direction of the optical fiber ribbon correspond.

[0086] Specifically, the longitudinal position of the optical fiber ribbon of the joint (20) that joins the nth (n is a natural number greater than or equal to 1)th optical fiber (10) and the n+1th optical fiber (10) among a plurality of optical fibers (10) and the longitudinal position of the optical fiber ribbon of the joint (20) that joins the n+4th optical fiber (10) and the n+5th optical fiber (10) can be configured to correspond.

[0087] In the embodiment illustrated in FIG. 4, the longitudinal positions of the optical fiber ribbon with respect to the joint (20) that joins the 1st (n, n=1) optical fiber (10(1)) and the 2nd optical fiber (10(2)) among the 12 optical fibers (10) constituting the rollable optical fiber ribbon (100), the joint (20) that joins the 5th optical fiber (10(2)) and the 6th optical fiber (10(3)), and the joint (20) that joins the 9th optical fiber (10(7)) and the 10th optical fiber (10(8)) are all configured to correspond to each other so that the optical fiber ribbon can be formed substantially in a straight line in the width direction of the optical fiber.

[0088] In the rollable optical fiber ribbon (100) according to the present invention, since a pair of adjacent optical fibers (10) among a plurality of optical fibers (10) are joined through a plurality of joints (20) spaced apart from each other along the length direction of the optical fiber ribbon, the rollable optical fiber ribbon (100) is capable of rolling in the width direction while the plurality of optical fibers (10) are maintained in a mutually joined state at the joints (20) and are maintained in a non-joined state in the remaining area excluding the joints (20), so that the rollable optical fiber ribbon (100) can be efficiently accommodated in the internal space of a tube in an optical cable or a conduit.

[0089] In this way, in order to secure flexibility that enables width-wise rolling, the rollable optical fiber ribbon (100) according to the present invention can form the joint (20) that joins adjacent pairs of optical fibers (10) discontinuously, rather than forming it over the entire boundary area between adjacent pairs of optical fibers (10).

[0090] That is, by forming a plurality of joints (20) discontinuously along the length direction of the optical fiber ribbon and arranging the plurality of joints (20) spaced apart from each other, the bonding strength of the joints (20) can be reduced so that the optical fiber ribbon (100) can be configured to roll in the width direction.

[0091] Meanwhile, the shorter the length of the joint (20) and the lower the frequency of the joint (20) in the longitudinal direction of the optical fiber ribbon, the easier it is to roll the rollable optical fiber ribbon (100) in the width direction to minimize the volume, but the problem may occur that the boundary area of ​​a pair of adjacent optical fibers (10) is separated during the rolling process or the separated optical fibers (10) are damaged due to insufficient joint strength.

[0092] Conversely, in order to prevent the separation of the optical fiber (10), if the length of the joint (20) is increased and the frequency of the joint (20) in the longitudinal direction of the optical fiber ribbon is increased, the rollable optical fiber ribbon (100) may not roll easily, or the optical fiber (10) may be damaged during the branching process of the optical fiber (10), or a large amount of resin residue may remain in the branched optical fiber (10), and the optical fiber (10) may not be branched cleanly.

[0093] Accordingly, the present invention applies a joint having the following form to enable width-wise rolling, while preventing a pair of adjacent optical fibers (10) from being separated from each other during the rolling process, and further preventing damage to the optical fiber (10) and enabling easy branching even when a specific optical fiber (10) is branched.

[0094] Specifically, in order to form a joint of a rollable optical fiber ribbon (100) according to the present invention, each joint (20) has a length (L B) is 5 millimeters (mm) to 18 millimeters (mm), and the longitudinal separation distance (L) of the optical fiber ribbon between the joint (20) that joins the nth optical fiber (10) (n is a natural number greater than or equal to 1) and the n+1th optical fiber among a plurality of optical fibers (10) and the joint (20) that joins the n+1th optical fiber (10) and the n+2nd optical fiber (10) G ) is 3 millimeters (mm) to 15 millimeters (mm), and the non-joint length (L) between two adjacent joints (10) among the plurality of joints (20) that join a pair of adjacent optical fibers (10) N ) was composed of 30 millimeters (mm) to 70 millimeters (mm).

[0095] Here, the longitudinal separation distance (L) of the optical fiber ribbon of the above joint (20) G ) for the above joint length (L) B ) of the ratio (L) G / L B ) can be 0.4 to 2. If the longitudinal separation distance (L) of the optical fiber ribbon of the joint (20) G ) for the above joint length (L) B ) of the ratio (L) G / L B ) is less than 0.4, the flexibility of the optical fiber ribbon (100) may be reduced overall, making width-wise rolling difficult, while the longitudinal separation distance (L) of the optical fiber ribbon of the joint (20) G ) for the above joint length (L) B ) of the ratio (L) G / L B ) exceeds 2, it was confirmed that although width-wise rolling of the optical fiber ribbon (100) is possible, the optical fiber (10) due to the joint (20) is unintentionally spread apart between the core wires, making it difficult to perform bulk connection work.

[0096] In addition, the longitudinal separation distance (L) of the above joint (20) G ) is the length (L) of the above joint (20). B) may be less than or equal to.

[0097] And, the length (L) of the above joint (20) B ) for the above non-joint length (L) N ) of the ratio (L) N / L B ) can be 2 to 10. If the length (L) of the joint (20) B ) for the above non-joint length (L) N ) of the ratio (L) N / L B ) is less than 2, the flexibility of the optical fiber ribbon (100) is reduced, so that the optical fiber (10) may be broken during the rolling process or the branching of a specific optical fiber (10) may not be easy, while the length (L) of the joint (20) B ) for the above non-joint length (L) N ) of the ratio (L) N / L B ) exceeds 10, it was confirmed that although width-wise rolling of the optical fiber ribbon (100) is possible, the bonding strength by the joint (20) is insufficient, resulting in a problem in which the optical fiber (10) is easily separated.

[0098] Meanwhile, the joints (20) of the above-mentioned rollable optical fiber ribbon (100) are arranged periodically and repeatedly in the longitudinal direction, and the length of the joints (20) (L) B ), non-joint length (L N ) and the longitudinal separation distance (L) of the optical fiber ribbon of the joint (20) G ) can preferably have a period (P) of 24 millimeters (mm) to 84 millimeters (mm).

[0099] The joint (20) of the rollable optical fiber ribbon (100) according to the present invention can be formed by UV curing or laser sintering various resins or resins such as UV curable resin or laser sintering powder, and the amount of the resin or resin forming the joint (20) can be formed to be substantially the same.

[0100] The rollable optical fiber ribbon (100) according to the present invention is formed by controlling the properties of the joint (20) to a predetermined range under the premise that a specific pattern of the joint (20) described above is formed, thereby preventing the resin of the joint (20) from spreading and maintaining the shape of the joint (20), and providing sufficient joint strength to the joint (20) to prevent separation and damage of the optical fiber (10) when the optical fiber ribbon (100) is rolled in the width direction.

[0101] Specifically, the above joint (20) may have an elongation of the cured or sintered resin in the range of 80% to 220% so that the joint (20) can be clearly and cleanly separated when the joined optical fiber (10) is separated while ensuring flexibility for widthwise rolling of the optical fiber ribbon (100).

[0102] In addition, since the plurality of joints (20) must have a sufficiently large stress so that the joint strength of the joints (20) is maintained excellently even after hardening or sintering and cracking or breakage of the joints (20) is prevented by external impact, the tensile strength of the joints (20) may be 7 MPa to 21 MPa.

[0103] And, in order to maintain the widthwise rolling or rolling state of the rollable optical fiber ribbon (100), the elastic cross modulus (Secant Modulus) of the joint (20) may be 30 MPa to 90 MPa at 2.5% strain.

[0104] Furthermore, in order to form a plurality of joints (20) spaced apart along the length direction of the optical fiber ribbon, the resin must be applied accurately and quickly, but must have appropriate flowability to prevent the curing or sintering dropping characteristics. Therefore, the viscosity of the resin constituting the joints (20) is 150 mPa·s to 440 mPa·s at 30°C, and the density is 0.52 g / cm at 23°C. 3 1.73 g / cm 3 It could be.

[0105] Hereinafter, various embodiments of the joint shape of the rollable optical fiber ribbon (100) according to the present invention will be described with reference to FIGS. 5 to 7. In the various embodiments of the rollable optical fiber ribbon (100) according to the present invention illustrated in FIGS. 5 to 7, any overlapping content with the embodiment of the rollable optical fiber ribbon (100) illustrated in FIG. 2 will be omitted.

[0106] As illustrated in FIGS. 5 to 7, the rollable optical fiber ribbon (100) according to the present invention may be configured such that each joint (20) for joining a pair of adjacent optical fibers (10) may be composed of a plurality of joint points (21) that are discontinuous or continuous in the longitudinal direction of the optical fiber ribbon.

[0107] In this way, the rollable optical fiber ribbon (100) according to the present invention is configured with a plurality of joint points (21) instead of filling the joint (20) with resin without any empty space, or by changing the shape thereof but configuring the joint pattern as shown in FIG. 2, so that the amount of resin constituting one joint (20) is further reduced, thereby improving the widthwise flexibility of the optical fiber ribbon (200) and the optical fiber (10) separation characteristics.

[0108] The rollable optical fiber ribbon (100) illustrated in FIG. 5 has each joint (20) formed by a plurality of joint points (21), and the plurality of joint points (21) may be spaced apart from each other along the length of the optical fiber ribbon. In the embodiment illustrated in FIG. 5, the joint (20) is illustrated as being formed by five bonding points (21), but the number of joint points (21) may be increased or decreased.

[0109] The rollable optical fiber ribbon (100) illustrated in FIG. 6 illustrates an embodiment in which each joint (20) is composed of two joint points (21) spaced apart from each other along the length of the optical fiber ribbon and one non-joined area (22) between the two joint points (21) that is not joined by the joint point (21).

[0110] As described above, the length (L) of the joint (20) B ) is in the range of 5 millimeters (mm) to 18 millimeters (mm), it was confirmed that when the ratio (x:y) of the length (x) of each bonding point (21) constituting the bonding portion (20) and the length (y) of the non-bonding region (22) is configured in the range of 0.8 to 1.2, the bonding force between a pair of adjacent optical fibers (10) can be stably maintained, while at the same time, the separation phenomenon between the optical fiber (10) and the bonding portion (20) during the widthwise rolling process of the optical fiber ribbon (100) can be prevented, and the stress applied to the optical fiber (10) bonded to each bonding portion (20) can be minimized.

[0111] The rollable optical fiber ribbon (100) illustrated in FIG. 7 can be configured such that each joint (20) is composed of a plurality of joint points (21), and the plurality of joint points (21) are integrally connected without being separated or spaced apart. When the plurality of joint points (21) are interconnected as illustrated in FIG. 7, the bonding strength between the optical fiber (10) and the joint (20) can be further improved than when the plurality of joint points (21) are spaced apart, and the deviation in separation strength at one joint (20) can be minimized, and the amount of resin can be sufficiently reduced compared to the embodiment illustrated in FIG. 2.

[0112] FIG. 8 illustrates an enlarged cross-sectional view of one embodiment of a rollable optical fiber ribbon according to the present invention, FIG. 9 illustrates an enlarged cross-sectional view of another embodiment of a rollable optical fiber ribbon according to the present invention, FIG. 10 illustrates another embodiment of an optical fiber ribbon according to the present invention, and FIG. 11 illustrates an enlarged cross-sectional view of another embodiment of a rollable optical fiber ribbon according to the present invention.

[0113] The optical fiber ribbon (100) illustrated in FIGS. 8 to 10 is formed by splicing 12 general optical fibers (10) together, satisfying the maximum width limit of 3.22 mm (3,220 μm) based on the IEC standard or ANSI / ICEA standard related to optical fiber ribbons or optical cables, while the optical fiber ribbon (100) can be spliced ​​so that most of the adjacent optical fibers (10) are mutually externally connected or spaced apart.

[0114] The embodiment illustrated in FIG. 8 is a case where the amount of resin placed on both sides of the optical fiber ribbon is substantially equal at a joint (20) of the optical fiber ribbon including mutually externally connected optical fibers (10).

[0115] The embodiment illustrated in FIG. 9 is a case where, in a joint (20) of an optical fiber ribbon including mutually externally connected optical fibers (10), the amount of resin disposed on one side of the optical fiber ribbon, for example, on the lower side of the optical fiber ribbon, is reduced compared to the amount of resin disposed on the other side of the optical fiber ribbon, for example, on the upper side of the optical fiber ribbon.

[0116] As shown in Fig. 9, instead of the resin applied to the two-sided joints (20) of the optical fiber ribbon (100) being applied in substantially the same amount, even when the resin applied to one-sided joint (20) is configured to be about 50% or less than the amount of resin applied to the other-sided joint area (20), not only is the rolling characteristic in one direction excellent when the optical fiber ribbon (100) is rolled, but the amount of resin can be reduced overall.

[0117] The embodiment illustrated in Fig. 10 is an embodiment in which resin is applied only to the upper portion of an optical fiber ribbon including mutually externally connected optical fibers (10).

[0118] As shown in Fig. 10, instead of forming a joint (20) by applying resin to both sides of the optical fiber ribbon (100), the joint (20) may be formed by applying resin only to one area of ​​either side of the optical fiber ribbon (100), for example, the upper portion among the upper and lower portions of the optical fiber ribbon, thereby effectively reducing the total amount of resin used.

[0119] In this case, in order to ensure sufficient bonding force between optical fibers (10) by the bonding portion (20) despite the formation of the bonding portion (20) on only one side of the optical fiber ribbon (100), the amount of resin applied per unit area forming the bonding portion (20) can be increased, and accordingly, as shown in FIG. 10, the bonding portion (20) can have an overall convex shape after the resin is cured.

[0120] The optical fiber ribbon (100) illustrated in Fig. 11 is composed of optical fibers (10) that are spaced apart from each other and joined together. When a fine-diameter optical fiber is applied, the optical fibers (10) are spaced apart and joined together with resin to form a joint (20), which can improve the bonding performance and facilitate the bulk connection operation.

[0121] Furthermore, the present invention can provide a method for manufacturing a rollable optical fiber ribbon (100) described with reference to FIGS. 2 to 11. The method for manufacturing the above-described rollable optical fiber ribbon (100) according to the present invention can be configured to include a step of arranging a plurality of optical fibers (10) in parallel; a step of transporting the plurality of optical fibers (10) arranged in parallel at a predetermined linear speed; a step of spraying a resin between the plurality of optical fibers (10) sprayed from a plurality of dispenser nozzles spaced apart from each other in the width direction of the optical fiber ribbon; and a step of UV-curing the sprayed resin to form a plurality of joints (20).

[0122] A plurality of dispenser nozzles can be spaced apart from each other between optical fibers to be bonded in a predetermined interval in the width direction of the optical fiber ribbon (100), and each of the plurality of dispenser nozzles can be adjusted in terms of timing at which the resin is sprayed, time at which the resin is sprayed, or amount of the resin sprayed.

[0123] Here, a plurality of dispenser nozzles provided in the width direction of the optical fiber ribbon (100) can be controlled to simultaneously spray resin at predetermined time intervals while a plurality of optical fibers (10) arranged in parallel are continuously sprayed. Here, in the step of spraying the optical fibers (10), the spraying speed of the optical fibers (10) can preferably be in the range of 50 m / min to 1000 m / min.

[0124] In addition, it may be configured with a plurality of dispenser sets including one or more of the dispensers spaced apart in the width direction of the optical fiber ribbon (100) to form a specific joint pattern on the optical fiber ribbon (100), and preferably, the number of the dispenser sets may be three or more.

[0125] Here, the plurality of dispenser sets can be configured by arranging them in multiple stages in the longitudinal direction of the optical fiber ribbon (100), and the dispenser nozzles of the dispensers included in each dispenser set can be configured in a synchronous manner to spray resin simultaneously, thereby reducing the nozzle control error of each dispenser and implementing a precise joint structure with minimized tolerance.

[0126] Accordingly, while a plurality of optical fibers (10) arranged in parallel are transported at high speed, at least one dispenser nozzle spaced apart in the width direction of the optical fiber ribbon alternately sprays resin at regular intervals, thereby efficiently forming a plurality of joints (20) on the optical fiber ribbon (100) whose positions in the width direction of the optical fiber ribbon are all different without changing the positions of the dispenser nozzles.

[0127] In addition, the amount of resin constituting each joint and the size of the joint accordingly can be controlled by adjusting the hourly spray amount of the dispenser and the transport speed of the optical fiber.

[0128] While this specification has described preferred embodiments of the present invention, those skilled in the art will appreciate that various modifications and variations can be made to the present invention without departing from the spirit and scope of the invention as defined in the claims below. Therefore, any modified implementation that fundamentally includes the elements of the claims should be considered within the technical scope of the present invention.

Claims

1. A rollable optical fiber ribbon that can be rolled in the width direction. A plurality of optical fibers arranged in parallel in the longitudinal direction; and A plurality of joints are arranged spaced apart in the longitudinal direction of the ribbon and include a plurality of joints for jointing adjacent pairs of optical fibers among the plurality of optical fibers, The plurality of joints are arranged at corresponding positions in the width direction of the optical fiber ribbon, and three or more of the optical fibers are arranged between two joints adjacent in the width direction of the optical fiber ribbon, and the separation distance (W) between two joints adjacent in the width direction of the optical fiber ribbon G ) is 360 micrometers (μm) to 1120 micrometers (μm), The width of the above joint (W) B ) is the outer diameter (D) of the optical fiber F ) is less than twice the diameter of the rollable optical fiber ribbon.

2. In paragraph 1, The above joint length (L) B ) is a rollable optical fiber ribbon characterized by having a thickness of 5 millimeters (mm) to 18 millimeters (mm).

3. In paragraph 2, The longitudinal separation distance (L) of the optical fiber ribbons between the joint that joins the nth optical fiber (n is a natural number greater than or equal to 1) and the n+1th optical fiber among the plurality of optical fibers and the joint that joins the n+1th optical fiber and the n+2nd optical fiber G ) is a rollable optical fiber ribbon characterized by having a thickness of 3 millimeters (mm) to 15 millimeters (mm).

4. In paragraph 2, The longitudinal separation distance (L) of the optical fiber ribbon at the above joint G ) for the above joint length (L) B ) of the ratio (L) G / L B ) is a rollable optical fiber ribbon characterized by being 0.4 to 2.

5. In paragraph 2, The longitudinal separation distance (L) of the optical fiber ribbon at the above joint G ) is the length of the above joint (L B ) is less than or equal to a rollable optical fiber ribbon.

6. In paragraph 2, The shortest distance between two adjacent splices among multiple splices that splice a pair of adjacent optical fibers is the unspliced ​​length (L). N ) is a rollable optical fiber ribbon characterized by having a thickness of 30 millimeters (mm) to 70 millimeters (mm).

7. In paragraph 2, The above non-joint length (L) N ) for the above joint length (L) B ) of the ratio (L) N / L B ) is a rollable optical fiber ribbon characterized by having 2 to 10.

8. In paragraph 2, A rollable optical fiber ribbon characterized in that the longitudinal period (P) of the joint is 24 millimeters (mm) to 84 millimeters (mm).

9. In paragraph 1, The spacing (W) between two adjacent joints in the width direction of the optical fiber ribbon G ) is a rollable optical fiber ribbon characterized by having a diameter of 360 micrometers (μm) to 835 micrometers (μm).

10. In paragraph 1, A rollable optical fiber ribbon characterized in that the above joint is formed by applying UV-curable resin between a pair of adjacent optical fibers and then curing the applied resin.

11. In paragraph 10, The elongation after hardening of the above joint is 80% to 220%, Tensile strength is 7 MPa to 21 MPa, A rollable optical fiber ribbon characterized in that the elastic modulus is 30 MPa to 90 MPa at 2.5% strain.

12. In paragraph 10, The viscosity of the resin constituting the above joint is 150 mPa·s to 440 mPa·s at 30°C, Density is 0.52 g / cm at 23°C 3 1.73 g / cm 3 A rollable optical fiber ribbon characterized by:

13. In paragraph 1, A rollable optical fiber ribbon characterized in that the widthwise positions of the joints that join the nth optical fiber (n is a natural number greater than or equal to 1) and the n+1th optical fiber among a plurality of optical fibers, the joints that join the n+1th optical fiber and the n+2nd optical fiber, and the joints that join the n+2nd optical fiber and the n+3rd optical fiber do not correspond to each other.

14. In paragraph 13, A rollable optical fiber ribbon characterized in that the longitudinal positions of the optical fiber ribbons of the joints that join the nth optical fiber (n is a natural number greater than or equal to 1) and the n+1th optical fiber among a plurality of optical fibers and the joints that join the n+3rd optical fiber and the n+4th optical fiber correspond.

15. In paragraph 13, The widthwise positions of the optical fiber ribbons of the joints joining the n+3rd optical fiber and the n+4th optical fiber among the above plurality of optical fibers do not correspond, A rollable optical fiber ribbon, characterized in that the longitudinal positions of the optical fiber ribbons of the joint portion that joins the nth optical fiber and the n+1th optical fiber among the plurality of optical fibers and the joint portion that joins the n+4th optical fiber and the n+5th optical fiber correspond.

16. In paragraph 1, The width of the above joint (W) B ) is the outer diameter (D) of the optical fiber F ) is less than 1.6 times the diameter of the rollable optical fiber ribbon.

17. A method for manufacturing a rollable optical fiber ribbon according to any one of claims 1 to 16, A step of arranging multiple optical fibers in parallel; A step of transporting a plurality of optical fibers arranged in parallel at a line speed of 50 m / min to 1000 m / min; A step of spraying resin between a plurality of optical fibers transported from a plurality of dispenser nozzles spaced apart in the width direction of the optical fiber ribbon; and A method for manufacturing a rollable optical fiber ribbon, comprising: a step of UV curing a sprayed resin to form a plurality of joints; 18. In paragraph 17, The above plurality of dispensers are composed of a plurality of dispenser sets including one or more dispensers, Each set of dispensers is spaced apart at different positions along the length of the optical fiber ribbon, A rollable optical fiber ribbon, wherein each dispenser included in a set of dispensers is spaced apart in the width direction at corresponding positions in the length direction of the optical fiber ribbon.

19. In paragraph 18, A rollable optical fiber ribbon characterized in that resin is dispensed simultaneously from the dispenser nozzles of all dispensers.

20. In paragraph 18, A rollable optical fiber ribbon, characterized in that the number of the above dispenser sets is three or more.

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