fiber optic tape core

Abstract

The optical fiber tape core (1) has five or more optical fibers (20) and a plurality of connecting parts (10) that connect two adjacent optical fibers. The plurality of connecting parts (10) are intermittently arranged in the longitudinal direction (X direction) and the arrangement direction (Y direction). The optical fiber tape core has a first high-density region (D1), a first low-density region (S1), a second high-density region (D2), and a second low-density region (S2). The number density of the connecting parts (10) in the first low-density region (S1) is lower than the number density of the connecting parts (10) in the first high-density region (D1). The number density of the connecting parts (10) in the second low-density region (S2) is lower than the number density of the connecting parts (10) in the second high-density region (D2). The first low-density region (S1) and the second low-density region (S2) are offset in the length direction (X direction).

Description

Technology Field

[0001] The present invention relates to an optical fiber tape core.

[0002] The present application claims priority based on Japanese Patent Application No. 2021-115536 ​​filed in Japan on July 13, 2021, and incorporates the contents thereof herein by reference. Background Technology

[0003] Patent Document 1 discloses a plurality of optical fibers arranged in an arrangement direction perpendicular to the longitudinal direction and an optical fiber tape core having a plurality of connecting portions. The plurality of connecting portions are formed between two adjacent optical fibers in the arrangement direction and connect the two optical fibers. Prior art literature

[0004] Japanese Patent Publication No. 2021-43363 The problem to be solved

[0005] The optical fiber tape core of Patent Document 1 has a plurality of high-density regions (connected regions) and a plurality of low-density regions (unconnected regions) arranged alternately in the longitudinal direction. At least two connecting parts are arranged in each of the plurality of high-density regions. In each of the plurality of low-density regions, a connecting part that fixes the arrangement pitch between two adjacent optical fibers is not arranged. Meanwhile, the optical fiber tape core may be wrapped, for example, in a pressure tape or a sheath and used as an optical fiber cable. In the manufacture of such an optical fiber cable, a method is often used in which the optical fiber tape core is joined with other constituent members (pressure tape, sheath, etc.) while moving the optical fiber tape core along the longitudinal direction.

[0006] However, the portion of the optical fiber tape core where the connection is formed has greater rigidity compared to other portions. Consequently, the rigidity of the optical fiber tape core in each low-density region tends to be lower than the rigidity of the optical fiber tape core in each high-density region. For example, in the optical fiber tape core of Patent Document 1, high-density regions with high rigidity and low-density regions with low rigidity are alternately arranged in the longitudinal direction. When manufacturing an optical fiber cable, when the optical fiber tape core is moved, there is a possibility that the optical fiber tape core may ripple or twist in the portion with low rigidity. Such rippling or undulation of the optical fiber tape core may hinder the smooth manufacturing of the optical fiber cable.

[0007] The present invention is made in consideration of such circumstances and aims to provide an optical fiber tape core with improved rigidity. means of solving the problem

[0008] To solve the above problem, an optical fiber tape core according to one aspect of the present invention comprises five or more optical fibers arranged in an arrangement direction perpendicular to the longitudinal direction, and a plurality of connecting portions formed between two adjacent optical fibers in the arrangement direction and connecting the two optical fibers, wherein the plurality of connecting portions are intermittently arranged in the longitudinal direction and the arrangement direction, wherein the optical fiber tape core comprises at least one first high-density region and at least one first low-density region arranged at different positions in the longitudinal direction, and at least one second high-density region and at least one second low-density region arranged at different positions in the longitudinal direction, wherein in the first high-density region, at least two connecting portions among the plurality of connecting portions are arranged at positions different in the longitudinal direction and the arrangement direction, and in the second high-density region, at least two connecting portions among the plurality of connecting portions are arranged at positions different in the longitudinal direction and the arrangement direction, and the connecting portions in the first low-density region The number density is lower than the number density of the connection part in the first high-density region, the number density of the connection part in the second low-density region is lower than the number density of the connection part in the second high-density region, and the length dimension (L9) of the portion where the first low-density region and the second low-density region overlap in the arrangement direction is smaller than the length dimension (L6) of the first low-density region and the length dimension (L8) of the second low-density region. Effects of the invention

[0009] According to the above aspect of the present invention, an optical fiber tape core with improved rigidity can be provided. Brief explanation of the drawing

[0010] FIG. 1 is a plan view showing an optical fiber tape core wire according to a first embodiment of the present invention. FIG. 2 is a plan view showing an optical fiber tape core wire according to a second embodiment of the present invention. FIG. 3 is a plan view showing an optical fiber tape core wire according to a third embodiment of the present invention. FIG. 4 is a plan view showing an optical fiber tape core wire according to the fourth embodiment of the present invention. FIG. 5 is a plan view showing an optical fiber tape core wire according to the fifth embodiment of the present invention. FIG. 6 is a plan view showing an optical fiber tape core wire according to the sixth embodiment of the present invention. Specific details for implementing the invention

[0011] (First embodiment)

[0012] Hereinafter, an optical fiber tape core according to the first embodiment will be described based on the drawings.

[0013] As shown in FIG. 1, the optical fiber tape core (1) comprises a plurality of optical fibers (20). The plurality of optical fibers (20) are arranged in a direction perpendicular to the length direction of each optical fiber (20). The optical fiber tape core (1) further comprises a plurality of connecting parts (10) that connect two adjacent optical fibers (20) among the plurality of optical fibers (20).

[0014] In the example of FIG. 1, the number of optical fibers (20) provided by the optical fiber tape core (1) is 25. However, the number of optical fibers (20) can be appropriately changed, and if there are 5 or more, the number of optical fibers (20) is not limited.

[0015] (Definition of direction)

[0016] In the embodiment described herein, the longitudinal direction of the optical fiber tape core is simply referred to as the longitudinal direction (X). One direction in the longitudinal direction (X) is also referred to as the +X direction or to the right. The direction opposite to the +X direction is also referred to as the -X direction or to the left. The direction in which a plurality of optical fibers (20) are arranged is referred to as the arrangement direction (Y). The arrangement direction (Y) is orthogonal to the longitudinal direction (X). One direction in the arrangement direction (Y) is also referred to as the +Y direction or upward. The direction opposite to the +Y direction is also referred to as the -Y direction or downward. The direction orthogonal to the longitudinal direction (X) and the arrangement direction (Y) is referred to as the plane-perpendicular direction (Z).

[0017] Each optical fiber (20) has a waveguide and a cladding that are not shown. The waveguide is formed of, for example, glass. The waveguide has a core and a cladding. The cladding is formed of a resin or the like and covers the glass portion. As a specific material for the cladding, for example, UV-curing resin.

[0018] Each optical fiber (20) is extended along the longitudinal direction (X). Multiple optical fibers (20) are arranged in the arrangement direction (Y). A gap may be formed between two adjacent optical fibers (20) in the arrangement direction (Y), or the two optical fibers (20) may be in contact with each other. In the optical fiber tape core (1) according to the present embodiment, multiple optical fibers (20) are arranged at approximately a constant interval (arrangement pitch (P5)) in the arrangement direction (Y). Subsequently, the gap or surface contact between two adjacent optical fibers (20) in the arrangement direction (Y) is referred to as an inter-fiber area (B). In the example of FIG. 1, 25 optical fibers (20) and 24 inter-fiber areas (B) are arranged alternately in the arrangement direction (Y).

[0019] A plurality of connecting portions (10) are each formed in the inter-fiber region (B). The plurality of connecting portions (10) are intermittently arranged in the longitudinal direction (X) and the arrangement direction (Y). In this specification, the "intermittent arrangement" of the plurality of connecting portions (10) includes both cases where the spacing between the connecting portions (10) is constant and cases where it is not constant. Each connecting portion (10) connects two optical fibers (20) adjacent to the inter-fiber region (B) where the connecting portion (10) is arranged. More specifically, each connecting portion (10) connects the sheaths of two optical fibers (20) adjacent to the inter-fiber region (B) where the connecting portion (10) is arranged. That is, in the optical fiber tape core (1) according to the present embodiment, two optical fibers (20) adjacent in the arrangement direction (Y) are intermittently connected to each other in the longitudinal direction (X) by the plurality of connecting portions (10). The optical fiber tape core (1) is also referred to as an intermittent fixed tape core (1). Any material capable of connecting the sheath of an adjacent optical fiber (20) may be used as the connecting part (10). For example, a UV-curing resin may be used as the connecting part (10).

[0020] The optical fiber tape core (1) according to the present embodiment has a plurality of first high-density regions (D1), a plurality of first low-density regions (S1), a plurality of second high-density regions (D2), and a plurality of second low-density regions (S2). The plurality of first high-density regions (D1) and the plurality of first low-density regions (S1) are alternately arranged in the longitudinal direction (X). The plurality of second high-density regions (D2) and the plurality of second low-density regions (S2) are alternately arranged in the longitudinal direction (X). In the present embodiment, the first high-density region (D1) and the second high-density region (D2) are arranged at different positions in the arrangement direction (Y).

[0021] In this embodiment, the dimension (L1) in the arrangement direction (Y) of each first high-density region (D1) and the dimension (L2) in the arrangement direction (Y) of each first low-density region (S1) are approximately the same. The dimension (L3) in the arrangement direction (Y) of each second high-density region (D2) and the dimension (L4) in the arrangement direction (Y) of each second low-density region (S2) are approximately the same. Additionally, the dimension (L1) and the dimension (L3) are approximately the same. In this embodiment, the dimension in the length direction (X) of each first high-density region (D1) is dimension (L5) and is approximately constant. The dimension in the length direction (X) of each first low-density region (S1) is dimension (L6) and is approximately constant. The dimension in the length direction (X) of each second high-density region (D2) is dimension (L7) and is approximately constant. The dimension in the longitudinal direction (X) of each second low-density region (S2) is dimension (L8) and is approximately constant. However, each of the dimensions (L5 to L8) does not need to be approximately constant. Also, dimensions (L5) and dimensions (L7) may be approximately the same as each other. Dimensions (L6) and dimensions (L8) may be approximately the same as each other. In this embodiment, each region (D1, D2, S1, S2) includes 13 optical fibers (20) and 12 inter-fiber regions (B).

[0022] A region formed by combining a plurality of first high-density regions (D1) and a plurality of first low-density regions (S1) is referred to as the first region (A1). A region formed by combining a plurality of second high-density regions (D2) and a plurality of second low-density regions (S2) is referred to as the second region (A2). In this embodiment, the first region (A1) and the second region (A2) are adjacent to each other in the arrangement direction (Y). Additionally, the first region (A1) and the second region (A2) do not need to be adjacent to each other in the arrangement direction (Y).

[0023] In this embodiment, each of the plurality of first high-density regions (D1), each of the plurality of first low-density regions (S1), each of the plurality of second high-density regions (D2), and each of the plurality of second low-density regions (S2) are formed in an approximately rectangular shape. Subsequently, the right end edge of each first high-density region (D1) may be referred to as the first right end edge (D1RE), and the left end edge of each first high-density region (D1) may be referred to as the first left end edge (D1LE). Similarly, the right end edge of each second high-density region (D2) may be referred to as the second right end edge (D2RE), and the left end edge of each second high-density region (D2) may be referred to as the second left end edge (D2LE). In this embodiment, each end edge (D1RE, D1LE, D2RE, D2LE) is a line segment parallel to the arrangement direction (Y). At each end edge (D1RE, D1LE, D2RE, D2LE), at least one connecting part (10) is arranged to be in contact with each.

[0024] In this embodiment, the first right end edge (D1RE) of each first high-density area (D1) is also the left end edge of the first low-density area (S1) adjacent to the right of the first high-density area (D1). Likewise, the first left end edge (D1LE) of each first high-density area (D1) is also the right end edge of the first low-density area (S1) adjacent to the left of the first high-density area (D1). That is, each first high-density area (D1) and each first low-density area (S1) are demarcated by each first right end edge (D1RE) and each first left end edge (D1LE). In this embodiment, the second right end edge (D2RE) of each second high-density area (D2) is also the left end edge of the second low-density area (S2) adjacent to the right of the second high-density area (D2). Likewise, the second left end edge (D2LE) of each second high-density area (D2) is also the right end edge of the second low-density area (S2) adjacent to the left side of the second high-density area (D2). That is, each second high-density area (D2) and each second low-density area (S2) are demarcated by each second right end edge (D2RE) and each second left end edge (D2LE).

[0025] Below, the configuration of each first high-density region (D1) and each first low-density region (S1) is described.

[0026] In each first high-density area (D1), at least two connecting parts (10) are arranged among a plurality of connecting parts (10) with different positions in the longitudinal direction (X) and the arrangement direction (Y). In the example of FIG. 1, 12 connecting parts (10) are arranged in each first high-density area (D1). In the example of FIG. 1, the arrangement pattern of the 12 connecting parts (10) included in each first high-density area (D1) is approximately the same between each first high-density area (D1). More specifically, three groups of connecting parts (G) are arranged in each first high-density area (D1), and the three groups of connecting parts (G) are arranged in the arrangement direction (Y). Within each group of connecting parts (G), four connecting parts (10) are arranged continuously in a straight line. In other words, within each first high-density area (D1), 12 connecting parts (10) are arranged periodically in the arrangement direction (Y), with 4 connecting parts (10) (connecting part group (G)) as one unit. Also, the number of connecting parts (10) included in each connecting part group (G) can be appropriately changed, and if there are 2 or more, the number of connecting parts (10) is not limited. Within each connecting part group (G), multiple connecting parts may be arranged continuously in a curved shape. Also, the number of connecting part groups (G) included in each first high-density area (D1) can be appropriately changed. The number of connecting parts (10) included in each first high-density area (D1) can be appropriately changed, and if there are 2 or more, the number of connecting parts (10) is not limited.

[0027] In the example of FIG. 1, within each group of connecting parts (G), four connecting parts (10) are arranged at approximately a constant pitch (P1) in the longitudinal direction (X). Additionally, four connecting parts (10) are arranged at approximately a constant spacing (P2) in the longitudinal direction (X). Furthermore, four connecting parts (10) may be arranged without spacing (P2) in the longitudinal direction (X). That is, each connecting part (10) may overlap with one another in the arrangement direction (Y). Additionally, within each group of connecting parts (G), a fiber-to-fiber region (B) in which a certain connecting part (10) is arranged and a fiber-to-fiber region (B) in which the connecting part (10) closest to the connecting part (10) is arranged are adjacent in the arrangement direction (Y). Here, in each group of connection parts (G), the uppermost connection part (10) among the four connection parts (10) included in the group of connection parts (G) is referred to as the upper connection part. In each group of connection parts (G), the lowermost connection part (10) among the four connection parts (10) included in the group of connection parts (G) is referred to as the lower connection part. In this embodiment, three groups of connection parts (G) are adjacent in the arrangement direction (Y). For example, the fiber inter-region (B) where the upper connection part is arranged in the group of connection parts (G) located in the center among the three groups of connection parts (G), and the fiber inter-region (B) where the lower connection part is arranged in the group of connection parts (G) located in the upper among the three groups of connection parts (G), are adjacent. Likewise, the fiber inter-region (B) in which the lower connection part is arranged in the central connection group (G) among the three connection groups (G) and the fiber inter-region (B) in which the upper connection part is arranged in the lower connection group (G) among the three connection groups (G) are adjacent. Since each connection group (G) is adjacent in the arrangement direction (Y), one connection part (10) is arranged in each fiber inter-region (B) included in each first high-density area (D1).And, each group of connecting parts (G) does not have to be adjacent in the arrangement direction (Y).

[0028] In the example of FIG. 1, the three connecting parts (10) located furthest to the right among the four connecting parts (10) included in each connecting part group (G) of each first high-density area (D1) are positioned approximately the same as each other in the longitudinal direction (X). These three connecting parts (10) are in contact with the first right end edge (D1RE). Likewise, the three connecting parts (10) located furthest to the left among the four connecting parts (10) included in each connecting part group (G) are positioned approximately the same as each other in the longitudinal direction (X). These three connecting parts (10) are in contact with the first left end edge (D1LE).

[0029] In the example of FIG. 1, a group of connecting parts (G) identical to that of the first high-density area (D1) is arranged in each second high-density area (D2) (details will be described later). The group of connecting parts (G) is included in any one of the plurality of first high-density areas (D1) and the plurality of second high-density areas (D2). In addition, the first high-density area (D1) and the second high-density area (D2) may include connecting parts (10) that do not belong to the group of connecting parts (G).

[0030] The number density of the connecting parts (10) in each first low-density area (S1) is lower than the number density of the connecting parts (10) in each first high-density area (D1). Likewise, the number density of the connecting parts (10) in each second low-density area (S2) is lower than the number density of the connecting parts (10) in each second high-density area (D2). The "number density of the connecting parts (10) in the first low-density area (S1)" is the value obtained by dividing the number of connecting parts (10) included in the first low-density area (S1) by the area of ​​the first low-density area (S1). The "number density of the connecting parts (10) in the first high-density area (D1)" is the value obtained by dividing the number of connecting parts (10) included in the first high-density area (D1) by the area of ​​the first high-density area (D1). The number density of the second low-density region (S2) and the second high-density region (D2) is defined in the same way. In the example of FIG. 1, the connection part (10) is not included in each low-density region (S1, S2). That is, the number density of the connection part (10) in the low-density region (S1, S2) is zero. However, the connection part (10) may be included in the low-density region (S1, S2).

[0031] Hereinafter, the configuration of each second high-density region (D2) and each second low-density region (S2) will be described. In this embodiment, the configuration of each second high-density region (D2) is approximately the same as the configuration of each first high-density region (D1). Likewise, the configuration of each second low-density region (S2) is approximately the same as the configuration of each first low-density region (S1).

[0032] In each second high-density area (D2), at least two connecting parts (10) are arranged among a plurality of connecting parts (10) with different positions in the longitudinal direction (X) and the arrangement direction (Y). In the example of FIG. 1, 12 connecting parts (10) are arranged in each second high-density area (D2). In the example of FIG. 1, the arrangement pattern of the 12 connecting parts (10) included in each second high-density area (D2) is approximately the same between each second high-density area (D2). More specifically, three groups of connecting parts (G) are arranged in each second high-density area (D2), and the three groups of connecting parts (G) are arranged in the arrangement direction (Y). Within each group of connecting parts (G), four connecting parts (10) are arranged continuously in a straight line. In other words, within each second high-density area (D2), 12 connecting parts (10) are arranged periodically in the arrangement direction (Y), with 4 connecting parts (10) (connecting part group (G)) as one unit. Also, the number of connecting parts (10) included in each connecting part group (G) can be appropriately changed, and if there are 2 or more, the number of connecting parts (10) is not limited. Within each connecting part group (G), multiple connecting parts may be arranged continuously in a curved shape. Also, the number of connecting part groups (G) included in each second high-density area (D2) can be appropriately changed. The number of connecting parts (10) included in each second high-density area (D2) can be appropriately changed, and if there are 2 or more, the number of connecting parts (10) is not limited.

[0033] In the example of FIG. 1, within each group of connecting parts (G), four connecting parts (10) are arranged at approximately a constant pitch (P3) in the longitudinal direction (X). Additionally, four connecting parts (10) are arranged at approximately a constant spacing (P4) in the longitudinal direction (X). Furthermore, four connecting parts (10) may be arranged without spacing (P4) in the longitudinal direction (X). That is, each connecting part (10) may overlap with one another in the arrangement direction (Y). Also, within each group of connecting parts (G), a fiber-to-fiber region (B) in which a certain connecting part (10) is arranged and a fiber-to-fiber region (B) in which a connecting part (10) adjacent to said connecting part (10) is arranged are adjacent in the arrangement direction (Y). Three groups of connecting parts (G) are adjacent in the arrangement direction (Y). For example, the fiber inter-region (B) in which the upper connection part is arranged in the central connection group (G) among the three connection groups (G) and the fiber inter-region (B) in which the lower connection part is arranged in the upper connection group (G) among the three connection groups (G) are adjacent. Likewise, the fiber inter-region (B) in which the lower connection part is arranged in the central connection group (G) among the three connection groups (G) and the fiber inter-region (B) in which the upper connection part is arranged in the lower connection group (G) among the three connection groups (G) are adjacent. Since each connection group (G) is adjacent in the arrangement direction (Y), one connection part (10) is arranged in each fiber inter-region (B) included in each second high-density area (D2). Also, each connection group (G) does not have to be adjacent in the arrangement direction (Y).

[0034] In the example of FIG. 1, the three connecting parts (10) located furthest to the right among the four connecting parts (10) included in each connecting part group (G) of each second high-density area (D2) are positioned approximately the same as each other in the longitudinal direction (X). These three connecting parts (10) are in contact with the second right end edge (D2RE). Likewise, the three connecting parts (10) located furthest to the left among the four connecting parts (10) included in each connecting part group (G) are positioned approximately the same as each other in the longitudinal direction (X). These three connecting parts (10) are in contact with the second left end edge (D2LE).

[0035] Hereinafter, the positional relationships of each first high-density region (D1), each first low-density region (S1), each second high-density region (D2), and each second low-density region (S2) are explained.

[0036] In each first low-density region (S1) according to the present embodiment, there is at least one second low-density region (S2) that overlaps in the arrangement direction (Y). In other words, each first low-density region (S1) and each second low-density region (S2) overlap each other in the arrangement direction (Y). The dimension in the length direction (X) of each of the overlapping parts is dimension (L9) and is approximately constant.

[0037] In this embodiment, the dimension (L9) is smaller than the dimension (L6) in the longitudinal direction (X) of each first low-density region (S1) and the dimension (L8) in the longitudinal direction (X) of each second low-density region (S2). That is, L9 <L6 및 L9<L8을 만족한다. 또한, 치수(L9)는, 각각의 제1 고밀도 영역(D1)의 길이 방향(X)에서의 치수(L5) 및 각각의 제2 고밀도 영역(D2)의 길이 방향(X)에서의 치수(L7)보다 작다. 즉 L9<L5 및 L9<L7을 만족한다. 즉, 광섬유 테이프 심선(1)의 길이 방향(X)에 있어서 가장 강성이 낮아지는 부분(즉, 제1 저밀도 영역(S1)과 제2 저밀도 영역(S2)이 배열 방향(Y)에 있어서 중첩하는 부분)의 길이 방향(X)에서의 치수(L9)가, L5∼L8보다 짧아진다. 이로써, 광섬유 테이프 심선(1)의 길이 방향(X)에 있어서 가장 강성이 낮아지는 부분(즉 치수(L9)의 부분)의 면적을 축소하고, 광섬유 테이프 심선(1)의 강성을 전체적으로 높일 수 있다.

[0038] Subsequently, in each inter-fiber region (B) included in each first high-density region (D1), the connection part (10) located furthest to the right is referred to as the first right-end connection part (11R). In each inter-fiber region (B) included in each first high-density region (D1), the connection part (10) located furthest to the left is referred to as the first left-end connection part (11L). In each inter-fiber region (B) included in each second high-density region (D2), the connection part (10) located furthest to the right is referred to as the second right-end connection part (12R). In each inter-fiber region (B) included in each second high-density region (D2), the connection part (10) located furthest to the left is referred to as the second left-end connection part (12L). And, in the example of FIG. 1, for each inter-fiber region (B) included in each first high-density region (D1), there is only one connecting part (10) placed in the inter-fiber region (B). Accordingly, all connecting parts (10) included in each first high-density region (D1) correspond to both the first right-end connecting part (11R) and the first left-end connecting part (11L). Likewise, in the example of FIG. 1, all connecting parts (10) included in each second high-density region (D2) correspond to both the second right-end connecting part (12R) and the second left-end connecting part (12L).

[0039] In each first high-density area (D1), the straight line connecting the right ends of the two first right end connecting parts (11R) located furthest to the right is referred to as the first right straight line (D1R). Furthermore, if there are multiple locations (points) corresponding to the right end in each first right end connecting part (11R), the first right straight line (D1R) is defined to connect the midpoint between the two points located at both ends in the arrangement direction (Y) among the multiple locations. The same applies to the first left straight line (D1L), the second right straight line (D2R), and the second left straight line (D2L) defined next. In each first high-density area (D1), the straight line connecting the left ends of the two first left end connecting parts (11L) located furthest to the left is referred to as the first left straight line (D1L). In each second high-density area (D2), the straight line connecting the right ends of the two second right end connecting parts (12R) located furthest to the right is referred to as the second right straight line (D2R). In each second high-density area (D2), the straight line connecting the left ends of the two second left end connecting parts (12L) located furthest to the left is referred to as the second left straight line (D2L). In addition, in the example of FIG. 1, each first right straight line (D1R) overlaps with each first right end edge (D1RE), and each first left straight line (D1L) overlaps with each first left end edge (D1LE). Likewise, each second right straight line (D2R) overlaps with each second right end edge (D2RE).

[0040] In this embodiment, among the plurality of connecting parts (10) included in each first high-density area (D1), all of the connecting parts (10) that overlap with the first right straight line (D1R) (in the example of FIG. 1, three connecting parts (10) that touch the first right end edge (D1RE)) do not overlap with each of the plurality of second right straight lines (D2R). Likewise, among the plurality of connecting parts (10) included in each first high-density area (D1), all of the connecting parts (10) that overlap with the first left straight line (D1L) (in the example of FIG. 1, three connecting parts (10) that touch the first left end edge (D1LE)) do not overlap with each of the plurality of second left straight lines (D2L). Among the multiple connecting parts (10) included in each second high-density area (D2), all of the connecting parts (10) that overlap with the second right straight line (D2R) (in the example of FIG. 1, the three connecting parts (10) that touch the second right end edge (D2RE)) do not overlap with each of the multiple first right straight lines (D1R). Among the multiple connecting parts (10) included in each second high-density area (D2), all of the connecting parts (10) that overlap with the second left straight line (D2L) (in the example of FIG. 1, the three connecting parts (10) that touch the second left end edge (D2LE)) do not overlap with each of the multiple first left straight lines (D1L).

[0041] Next, the operation of the optical fiber tape core (1) configured as described above will be explained.

[0042] The optical fiber tape core (1) according to the present embodiment has a plurality of first high-density regions (D1) and a plurality of second high-density regions (D2) in which many connecting portions (10) are arranged, and a plurality of first low-density regions (S1) and a plurality of second low-density regions (S2) in which few connecting portions (10) are arranged (particularly in the example of FIG. 1, in which no connecting portions (10) are arranged). Here, in each of the first high-density regions (D1) and each of the second high-density regions (D2), a plurality of optical fibers (20) are connected to each other and formed as a single unit. In addition, the connecting portion (10) also serves to fix the arrangement pitch (P5) between two adjacent optical fibers (20). Thus, the arrangement pitch (P5) can be stabilized in each of the first high-density regions (D1) and each of the second high-density regions (D2).

[0043] However, when fusing a fiber optic tape core to another fiber optic tape core, a fusion device is generally used. A plurality of grooves extending along the longitudinal direction (X) are formed in the fusion device. Inside the fusion device, each optical fiber (20) included in the fiber optic tape core is inserted one by one into the aforementioned plurality of grooves for positioning. Here, the arrangement pitch (P5) is fixed by the connecting part (10). Accordingly, when performing a fusion operation on a certain fiber optic tape core, conventionally, a fusion device having grooves arranged according to the arrangement pitch (P5) of the optical fibers in the fiber optic tape core was used.

[0044] However, recently, research and development toward reducing the diameter of the optical fiber (20) is being actively carried out, and accordingly, the array pitch (P5) of the optical fiber (20) is also being reduced. Therefore, when attempting to fuse and connect optical fiber tape cores of different manufacturing times, a problem arises in which it becomes difficult to fuse and connect both optical fiber tape cores using a fusion machine because the array pitch (P5) of the two optical fiber tape cores is different.

[0045] In this regard, the optical fiber tape core (1) according to the present embodiment has a plurality of first low-density regions (S1) and a plurality of second low-density regions (S2). In each of the first low-density region (S1) and each of the second low-density regions (S2), a connecting part (10) that fixes the arrangement pitch (P5) between two adjacent optical fibers (20) is not arranged or is small. Accordingly, the user can change the arrangement pitch (P5) by pulling or compressing the optical fiber tape core (1) in the first low-density region (S1) or the second low-density region (S2) in the arrangement direction (Y). Thus, when fusing the optical fiber tape core (1), it becomes possible to use a fusion machine having an arrangement pitch (P5) different from that of the optical fiber tape core (1). In addition, it becomes possible to fuse the optical fiber tape core (1) to an optical fiber tape core having an arrangement pitch (P5) different from that of the optical fiber tape core (1).

[0046] Meanwhile, the optical fiber tape core (1) may be wrapped, for example, in a pressure tape or sheath and used as an optical fiber cable. In manufacturing such an optical fiber cable, a method of joining the optical fiber tape core (1) with other components (pressure tape, sheath, etc.) while moving the optical fiber tape core (1) along the length direction (X) is often adopted.

[0047] Here, the portion where the connection portion (10) is formed between the optical fibers (20) has greater rigidity compared to the portion where the connection portion (10) is not formed. Accordingly, the rigidity of the optical fiber tape core (1) in each low-density area (S1, S2) is likely to be lower than the rigidity of the optical fiber tape core (1) in each high-density area (D1, D2). For example, in the case of an optical fiber tape core in which only a plurality of high-density areas and a plurality of low-density areas are alternately arranged in the longitudinal direction (in the case of an optical fiber tape core having only one of the first area (A1) and the second area (A2) in this embodiment), there exists a portion (each low-density area) with extremely low rigidity in the longitudinal direction of the optical fiber tape core. In the case of an optical fiber tape core in which such a portion with extremely low rigidity exists, there was a possibility that when the optical fiber tape core was moved, the optical fiber tape core would ripple or twist in the portion with extremely low rigidity. Such wavy or undulating fiber optic tape core wires were hindering the smooth manufacturing of fiber optic cables.

[0048] In this regard, the optical fiber tape core (1) according to the present embodiment has both a first region (A1) and a second region (A2), and the first region (A1) and the second region (A2) are offset from each other in the longitudinal direction (X). More specifically, each first high-density region (D1) and each second high-density region (D2) are arranged offset from each other in the longitudinal direction (X), and each first low-density region (S1) and each second low-density region (S2) are arranged offset from each other in the longitudinal direction (X). As a result, the dimension (L9) in the longitudinal direction (X) of the optical fiber tape core (1) at the part where the rigidity is lowest in the longitudinal direction (X) (i.e., the part where the first low-density region (S1) and the second low-density region (S2) overlap in the arrangement direction (Y)) is shortened. That is, the dimension (L9) in the length direction (X) of the part of the optical fiber tape core (1) with particularly low rigidity can be shortened. Therefore, the rigidity of the optical fiber tape core (1) can be increased overall, and the rippling or twisting of the optical fiber tape core (1) when the optical fiber tape core (1) is moved can be suppressed.

[0049] As described above, the optical fiber tape core (1) according to the present embodiment comprises five or more optical fibers (20) arranged in an arrangement direction (Y) and a plurality of connecting parts (10) formed between two adjacent optical fibers (20) in the arrangement direction (Y) and connecting the two optical fibers (20), wherein the plurality of connecting parts (10) are intermittently arranged in the length direction (X) and the arrangement direction (Y). The optical fiber tape core (1) has a plurality of first high-density regions (D1) and a plurality of first low-density regions (S1) alternately arranged in the length direction (X), and a plurality of second high-density regions (D2) and a plurality of second low-density regions (S2) alternately arranged in the length direction (X). In each of the plurality of first high-density regions (D1), there are at least two of the plurality of connecting parts (10) whose positions in the length direction (X) and the arrangement direction (Y) are different. A connecting portion (10) is arranged, and in each of a plurality of second high-density regions (D2), at least two connecting portions (10) are arranged among the plurality of connecting portions (10) with different positions in the longitudinal direction (X) and the arrangement direction (Y), and the number density of the connecting portion (10) in each of the plurality of first low-density regions (S1) is lower than the number density of the connecting portion (10) in each of the plurality of first high-density regions (D1), and the number density of the connecting portion (10) in each of the plurality of second low-density regions (S2) is lower than the number density of the connecting portion (10) in each of the plurality of second high-density regions (D2), and the dimension (L9) in the longitudinal direction (X) of each part where each of the plurality of first low-density regions (S1) and each of the plurality of second low-density regions (S2) overlap in the arrangement direction (Y) is in the longitudinal direction (X) of each of the plurality of first low-density regions (S1). It is smaller than the dimension (L8) in the length direction (X) of each dimension (L6) and the second low-density region (S2).

[0050] With this configuration, a first low-density region (S1), which has lower rigidity compared to a first high-density region (D1), and a second low-density region (S2), which has lower rigidity compared to a second high-density region (D2), are arranged offset in the longitudinal direction (X). As a result, compared to the case where, for example, the first low-density region (S1) and the second low-density region (S2) are not offset in the longitudinal direction (X), the dimension (L9) in the longitudinal direction (X) of the optical fiber tape core (1) at the lowest rigidity (i.e., the part where the first low-density region (S1) and the second low-density region (S2) overlap in the arrangement direction (Y)) is shortened. Therefore, the rigidity of the optical fiber tape core (1) can be increased overall, and rippling or twisting of the optical fiber tape core (1) when the optical fiber tape core (1) is moved can be suppressed.

[0051] Additionally, among the plurality of connecting parts (10) included in each of the plurality of first high-density areas (D1), the connecting part (10) that overlaps with the first right straight line (D1R) does not overlap with each of the plurality of second right straight lines (D2R); among the plurality of connecting parts (10) included in each of the plurality of first high-density areas (D1), the connecting part (10) that overlaps with the first left straight line (D1L) does not overlap with each of the plurality of second left straight lines (D2L); among the plurality of connecting parts (10) included in each of the plurality of second high-density areas (D2), the connecting part (10) that overlaps with the second right straight line (D2R) does not overlap with each of the plurality of first right straight lines (D1R); and among the plurality of connecting parts (10) included in each of the plurality of second high-density areas (D2), the connecting part (10) that overlaps with the second left straight line (D2L) does not overlap with each of the plurality of first left straight lines (D1L). With this configuration, the misalignment in the longitudinal direction (X) of the first low-density region (S1) and the second low-density region (S2) becomes larger. In other words, the dimension (L9) becomes shorter. This allows the rigidity of the optical fiber tape core (1) to be increased.

[0052] Additionally, the dimension (L9) in the length direction (X) of each part where each of the plurality of first low-density regions (S1) and each of the second low-density regions (S2) overlap in the arrangement direction (Y) is smaller than the dimension (L5) in the length direction (X) of each of the plurality of first high-density regions (D1) and the dimension (L7) in the length direction (X) of each of the plurality of second high-density regions (D2). With this configuration, the dimension in the length direction (X) of each high-density region (D1, D2), which has higher rigidity, becomes larger than the part with particularly low rigidity in the length direction (X) of the optical fiber tape core (1). Accordingly, the rigidity of the optical fiber tape core (1) as a whole is further improved.

[0053] In addition, at least one connecting part (10) is disposed in each of the multiple inter-fiber regions (B) included in each of the multiple first high-density regions (D1), and at least one connecting part (10) is disposed in each of the multiple inter-fiber regions (B) included in each of the multiple second high-density regions (D2). With this configuration, the separation of the optical fiber tape core (1) in the arrangement direction (Y) in the first high-density region (D1) or the second high-density region (D2) is suppressed.

[0054] Additionally, at least one connecting part (10) is disposed on each of each of the plurality of first right end edges (D1RE) and each of the plurality of first left end edges (D1LE), and at least one connecting part (10) is disposed on each of the plurality of second right end edges (D2RE) and each of the plurality of second left end edges (D2LE). Thus, the rigidity of each first high-density region (D1) can be improved compared to the case where, for example, no connecting part (10) is disposed on each of the first right end edges (D1RE) and each of the first left end edges (D1LE). Likewise, the rigidity of each second high-density region (D2) can be improved compared to the case where no connecting part (10) is disposed on each of the second right end edges (D2RE) and each of the second left end edges (D2LE). Accordingly, the rigidity of the optical fiber tape core (1) can be increased overall.

[0055] In addition, the first region (A1), which is a region formed by combining a plurality of first high-density regions (D1) and a plurality of first low-density regions (S1), and the second region (A2), which is a region formed by combining a plurality of second high-density regions (D2) and a plurality of second low-density regions (S2), are adjacent in the arrangement direction (Y). With this configuration, for example, compared to the case where the first region (A1) and the second region (A2) are not adjacent in the arrangement direction (Y), the bending of the optical fiber tape core (1) along the length direction (X) axis is suppressed.

[0056] In addition, in the arrangement direction (Y), the respective dimensions (L1) of a plurality of first high-density regions (D1) and the respective dimensions (L2) of a plurality of first low-density regions (S1) are identical to each other, and the respective dimensions (L3) of a plurality of second high-density regions (D2) and the respective dimensions (L4) of a plurality of second low-density regions (S2) are identical to each other. Thus, the rigidity of the optical fiber tape core (1) can be increased compared to, for example, the case where the dimension (L1) is smaller than the dimension (L2) and the dimension (L3) is smaller than the dimension (L4).

[0057] (Second embodiment)

[0058] Next, a second embodiment of the present invention will be described, but the basic configuration is the same as that of the first embodiment. Accordingly, the same reference numerals are assigned to identical configurations, so their descriptions are omitted, and only differences are described. The optical fiber tape core (2) according to the present embodiment shown in FIG. 2 has a positional relationship of each region (D1, D2, S1, S2) that is different from that of the first embodiment.

[0059] As shown in FIG. 2, in this embodiment, each first high-density region (D1) and each second high-density region (D2) do not overlap each other in the arrangement direction (Y). In addition, each first low-density region (S1) and two second low-density regions (S2) closest to the first low-density region (S1) are arranged so that their ends in the length direction (X) overlap in the arrangement direction (Y). Likewise, each second low-density region (S2) and two first low-density regions (S1) closest to the second low-density region (S2) are arranged so that their ends in the length direction (X) overlap in the arrangement direction (Y).

[0060] In this case, the entire length direction (X) of the first high-density region (D1) is adjacent to the second low-density region (S2) in the arrangement direction (Y). Likewise, the entire length direction (X) of the second high-density region (D2) is adjacent to the first low-density region (S1) in the arrangement direction (Y). According to this arrangement, the first low-density region (S1), which is a part with lower rigidity compared to the first high-density region (D1), is reinforced by the second high-density region (D2). Likewise, the second low-density region (S2), which is a part with lower rigidity compared to the second high-density region (D2), is reinforced by the first high-density region (D1).

[0061] As described above, in the optical fiber tape core (2) according to the present embodiment, each of the plurality of first high-density regions (D1) and each of the plurality of second high-density regions (D2) do not overlap each other in the arrangement direction (Y). With this configuration, it becomes possible to reinforce the low-density regions (S1, S2) with low rigidity by the high-density regions (D1, D2) with high rigidity. Accordingly, the rigidity of the optical fiber tape core (2) can be improved overall.

[0062] (Third embodiment)

[0063] Next, a third embodiment of the present invention will be described, but the basic configuration is the same as that of the first embodiment. Accordingly, the same reference numerals are assigned to identical configurations, so their descriptions are omitted, and only differences are described. The optical fiber tape core (3) according to the present embodiment shown in FIG. 3 has a positional relationship of each region (D1, D2, S1, S2) that is different from that of the first embodiment.

[0064] As shown in FIG. 3, in this embodiment, each first low-density region (S1) and each second low-density region (S2) do not overlap each other in the arrangement direction (Y). In addition, each first high-density region (D1) and two second high-density regions (D2) closest to the first high-density region (D1) are arranged so that their ends in the length direction (X) overlap in the arrangement direction (Y). Likewise, each second high-density region (D2) and two first high-density regions (D1) closest to the second high-density region (D2) are arranged so that their ends in the length direction (X) overlap in the arrangement direction (Y).

[0065] In this case, a first high-density region (D1) or a second high-density region (D2) is positioned at any location along the longitudinal direction (X) of the optical fiber tape core (3). Accordingly, a region of high rigidity is positioned at any location along the longitudinal direction (X) of the optical fiber tape core (3).

[0066] As described above, in the optical fiber tape core (3) according to the present embodiment, each of the plurality of first low-density regions (S1) and each of the plurality of second low-density regions (S2) do not overlap with each other. With this configuration, the rigidity of the optical fiber tape core (3) can be improved more reliably.

[0067] (Fourth embodiment)

[0068] Next, the fourth embodiment of the present invention will be described, but the basic configuration is the same as the first embodiment. Accordingly, the same reference numerals are assigned to identical configurations, so their descriptions are omitted, and only the differences are described. The optical fiber tape core (4) according to the present embodiment shown in FIG. 4 has a configuration of each high-density region (D1, D2) that is different from the first embodiment.

[0069] As shown in FIG. 4, in the optical fiber tape core (4) according to the present embodiment, a plurality of connecting parts (10) (2 in FIG. 4) are arranged in each of the multiple (12 locations in FIG. 4) inter-fiber regions (B) included in each high-density region (D1, D2). In the example of FIG. 4, 24 connecting parts (10) are arranged in each high-density region (D1, D2). In addition, three or more connecting parts (10) may be arranged in each inter-fiber region (B). A different number of connecting parts (10) may be arranged in each inter-fiber region (B).

[0070] In this way, when a plurality of connecting parts (10) are included in each inter-fiber region (B) within the high-density region (D1, D2), in each inter-fiber region (B), the connecting part (10) corresponding to the first right-side connecting part (11R) and the connecting part (10) corresponding to the first left-side connecting part (11L) are different from each other.

[0071] According to the optical fiber tape core (4) of the present embodiment, the same functional effect as that of the optical fiber tape core (1) according to the first embodiment is obtained. In addition, by increasing the number of connecting parts (10) disposed in each inter-fiber region (B), the rigidity of the optical fiber tape core (4) in each high-density region (D1, D2) can be improved. By doing so, the rigidity of the optical fiber tape core (4) can be further improved overall.

[0072] (Fifth embodiment)

[0073] Next, a fifth embodiment of the present invention will be described, but the basic configuration is the same as that of the first embodiment. Accordingly, the same reference numerals are assigned to identical components, their descriptions are omitted, and only the differences are described.

[0074] The optical fiber tape core (5) according to the present embodiment shown in FIG. 5 has a configuration of each high-density region (D1, D2) that is different from the first embodiment.

[0075] As shown in FIG. 5, in the optical fiber tape core (5) according to the present embodiment, one group of connection parts (G) is arranged in each high-density area (D1, D2). In addition, within the group of connection parts (G), a plurality (12 in FIG. 5) of connection parts (10) are arranged in a row. In particular, in the example of FIG. 5, the 12 connection parts are arranged in a curved continuous manner. In other words, within the group of connection parts (G) included in each high-density area (D1, D2), the pitch (P1, P3) at which the connection parts (10) are arranged is not constant.

[0076] In this case, in each first high-density area (D1), the first right end edge (D1RE) and the first right straight line (D1R) do not overlap, and the first left end edge (D1LE) and the first left straight line (D1L) do not overlap. Likewise, in each second high-density area (D2), the second right end edge (D2RE) and the second right straight line (D2R) do not overlap, and the second left end edge (D2LE) and the second left straight line (D2L) do not overlap. Furthermore, in the optical fiber tape core (5) according to the present embodiment, among the plurality of connection parts (10) included in each first high-density area (D1), the connection part (10) that overlaps with the first right straight line (D1R) does not overlap with each of the plurality of second right straight lines (D2R). Likewise, among the plurality of connecting parts (10) included in each first high-density area (D1), the connecting part (10) that overlaps with the first left straight line (D1L) does not overlap with each of the plurality of second left straight lines (D2L). Among the plurality of connecting parts (10) included in each second high-density area (D2), the connecting part (10) that overlaps with the second right straight line (D2R) does not overlap with each of the plurality of first right straight lines (D1R). Among the plurality of connecting parts (10) included in each second high-density area (D2), the connecting part (10) that overlaps with the second left straight line (D2L) does not overlap with each of the plurality of first left straight lines (D1L).

[0077] According to the optical fiber tape core (5) according to the present embodiment, the same functional effect as the optical fiber tape core (1) according to the first embodiment is obtained. In addition, since a plurality of connecting parts (10) included in each high-density area (D1, D2) are connected as one group of connecting parts (G), it becomes possible to arrange a plurality of connecting parts (10) in each high-density area (D1, D2) in a traversable figure (figure written in one stroke). Thus, for example, when manufacturing the optical fiber tape core (5), if the dispenser dispensing the resin that becomes the connecting part (10) is moved, the travel distance of the dispenser is shortened, and manufacturing efficiency is improved.

[0078] (6th embodiment)

[0079] Next, the sixth embodiment of the present invention will be described, but the basic configuration is the same as the first embodiment. Accordingly, the same reference numerals are assigned to identical configurations, so their descriptions are omitted, and only the differences are described. The optical fiber tape core (6) according to the present embodiment shown in FIG. 6 has a configuration of each low-density region (S1, S2) that is different from the first embodiment.

[0080] As shown in FIG. 6, in the optical fiber tape core (6) according to the present embodiment, a connecting part (10) is disposed in each low-density region (S1, S2). Also, in the optical fiber tape core (6) according to the present embodiment, the number density of the connecting part (10) in each first low-density region (S1) is lower than the number density of the connecting part (10) in each first high-density region (D1). Likewise, the number density of the connecting part (10) in each second low-density region (S2) is lower than the number density of the connecting part (10) in each second high-density region (D2).

[0081] According to the optical fiber tape core (6) according to the present embodiment, the same functional effect as the optical fiber tape core (1) according to the first embodiment is obtained. In addition, since a connecting part (10) is arranged in each low-density area (S1, S2), the rigidity of the optical fiber tape core (6) in each low-density area (S1, S2) can be improved. Thus, the rigidity of the optical fiber tape core (6) can be improved overall. In addition, when fusing the optical fiber tape core (6), the connecting part (10) included in the low-density area (S1, S2) can be peeled off to change the pitch between the optical fibers (20). Since the number of connecting parts (10) included in the low-density area (S1, S2) is small, peeling them off is easy.

[0082] Furthermore, in this specification, for example, the term "approximately identical" includes cases where they can be considered identical once manufacturing errors are removed. The same applies to other expressions using "approximately." That is, expressions using "approximately" include cases where the semantic content indicated by the phrase following "approximately" can be considered valid once manufacturing errors are removed.

[0083] Furthermore, the technical scope of the present invention is not limited to the above embodiments, and various modifications may be made within the scope that does not deviate from the spirit of the present invention.

[0084] For example, in the above embodiment, for each of the plurality of first high-density regions (D1), the plurality of first low-density regions (S1), the plurality of second high-density regions (D2), and the plurality of second low-density regions (S2), L9 <L6 및 L9<L8을 만족했다. 그러나, 적어도 1개의 제1 고밀도 영역(D1), 제1 저밀도 영역(S1), 제2 고밀도 영역(D2), 및 제2 저밀도 영역(S2)에 대하여 L9<L6 및 L9<L8을 만족함으로써, 상기 부분에 있어서 강성을 향상시키는 효과는 얻어진다. 그 외의 치수 관계에 대해서도 동일하다.

[0085] Additionally, the arrangement pattern of the plurality of connecting parts (10) included in each first high-density area (D1) does not have to be the same between each first high-density area (D1). Likewise, the arrangement pattern of the plurality of connecting parts (10) included in each second high-density area (D2) does not have to be the same between each second high-density area (D2).

[0086] Additionally, the dimensions of each connecting part (10) in the length direction (X) and arrangement direction (Y) do not have to be the same between each connecting part (10).

[0087] In addition, the multiple connecting parts (10) included in each high-density area (D1, D2) do not need to form a connecting part group (G).

[0088] In other words, in each high-density area (D1, D2), multiple connecting parts (10) may be arranged randomly.

[0089] Likewise, in each low-density area (S1, S2), a plurality of connecting parts (10) may be arranged randomly.

[0090] Additionally, if there are multiple connecting parts (10) included in the first high-density area (D1) that overlap with the first right straight line (D1R), some of the multiple connecting parts (10) may overlap with the second right straight line (D2R). However, it is preferable that all of the multiple connecting parts (10) do not overlap with the second right straight line (D2R), as this causes the misalignment in the longitudinal direction (X) of the first low-density area (S1) and the second low-density area (S2) to be greater, thereby ensuring a more reliable increase in the rigidity of the optical fiber tape core (1). The same applies when there are multiple connecting parts (10) included in the first high-density area (D1) that overlap with the first left straight line (D1L). The same applies when there are multiple connecting parts (10) included in the second high-density area that overlap with the second right straight line (D2R). The same applies when there are multiple connecting parts (10) that are included in the second high-density area and overlap with the second left straight line (D2L).

[0091] Furthermore, within the scope of not departing from the spirit of the present invention, it is appropriately possible to change the components of the above-described embodiments to well-known components, and also appropriately combine the above-described embodiments or variations. Explanation of the symbols

[0092] 1~6: Fiber optic tape core wires 10: Connection part 11R: First right end connection 11L: 1st left end connection 12R: Second right end connection 12L: Second left end connection 20: Fiber Optic D1: First high-density zone D1R: First right straight line D1RE: First right edge (edge ​​in the longitudinal direction of the first high-density region) D1L: 1st left straight line D1LE: 1st left end edge (end edge in the longitudinal direction of the 1st high-density region) D2: Second high-density zone D2R: Second right straight line D2RE: Second right edge (edge ​​in the longitudinal direction of the second high-density region) D2L: Second left straight line D2LE: Second left edge (edge ​​along the length of the second high-density region) S1: First low-density region S2: Second low-density region A1: Area 1 A2: Area 2 X: Length direction Y: Array direction

Claims

Claim 1 Five or more optical fibers arranged in an arrangement direction perpendicular to the longitudinal direction; and each having a plurality of connecting portions formed between two adjacent optical fibers in the arrangement direction and connecting the two optical fibers; wherein the plurality of connecting portions are intermittently arranged in the length direction and the arrangement direction, the optical fiber tape core wire having a plurality of first high-density regions and at least one first low-density region arranged at different positions in the length direction, and a plurality of second high-density regions and at least one second low-density region arranged at different positions in the length direction, wherein at least two connecting portions among the plurality of connecting portions are arranged at positions different in the length direction and the arrangement direction, and at least two connecting portions among the plurality of connecting portions are arranged at positions different in the length direction and the arrangement direction, and wherein the number density of the connecting portions in the first low-density region is lower than the number density of the connecting portions in the first high-density region, and The number density of the connection portion in the second low-density region is lower than the number density of the connection portion in the second high-density region, and the length dimension (L9) in the length direction of the portion where the first low-density region and the second low-density region overlap in the arrangement direction is smaller than the length dimension (L6) in the length direction of the first low-density region and the length dimension (L8) in the length direction of the second low-density region, one direction in the length direction is referred to as the right, and the direction opposite to the right is referred to as the left, the space between two adjacent optical fibers is referred to as the inter-fiber region, and in each of the plurality of inter-fiber regions included in the first high-density region, the connection portion located furthest to the right is referred to as the first right-end connection portion, and in each of the plurality of inter-fiber regions included in the first high-density region, the connection portion located furthest to the left is referred to as the first left-end connection portion.In each of the plurality of inter-fiber regions included in the second high-density region, the connection located furthest to the right is referred to as the second right-end connection, and in each of the plurality of inter-fiber regions included in the second high-density region, the connection located furthest to the left is referred to as the second left-end connection; a straight line connecting the right ends of the two first right-end connections located furthest to the right among the plurality of first right-end connections included in the first high-density region is referred to as the first right-end straight line; a straight line connecting the left ends of the two first left-end connections located furthest to the left among the plurality of first left-end connections included in the first high-density region is referred to as the first left-end straight line; a straight line connecting the right ends of the two second right-end connections located furthest to the right among the plurality of second right-end connections included in the second high-density region is referred to as the second right-end straight line; and the two second left-end connections located furthest to the left among the plurality of second left-end connections included in the second high-density region When the straight line connecting the left end of the left end connecting portion is referred to as the second left straight line, the connecting portion included in the first high-density region and overlapping with the first right straight line does not overlap with the second right straight line, the connecting portion included in the first high-density region and overlapping with the first left straight line does not overlap with the second left straight line, the connecting portion included in the second high-density region and overlapping with the second right straight line does not overlap with the first right straight line, the connecting portion included in the second high-density region and overlapping with the second left straight line does not overlap with the first left straight line, the connecting portion is not included in the first low-density region, and the connecting portion is not included in the second low-density region, an optical fiber tape core wire. Claim 2 In claim 1, the dimension (L9) in the length direction of the portion where the first low-density region and the second low-density region overlap in the arrangement direction is smaller than the dimension (L5) in the length direction of the first high-density region and the dimension (L7) in the length direction of the second high-density region, an optical fiber tape core. Claim 3 An optical fiber tape core according to claim 1 or 2, wherein, when the space between two adjacent optical fibers is referred to as an inter-fiber region, at least one connection part is disposed in each of the plurality of inter-fiber regions included in the first high-density region, and at least one connection part is disposed in each of the plurality of inter-fiber regions included in the second high-density region. Claim 4 An optical fiber tape core according to claim 1 or 2, wherein at least one connecting part is disposed at each end edge in the longitudinal direction of the first high-density region, and at least one connecting part is disposed at each end edge in the longitudinal direction of the second high-density region. Claim 5 In claim 1 or 2, the first region, which is the combined region of the first high-density region and the first low-density region, and the second region, which is the combined region of the second high-density region and the second low-density region, are optical fiber tape cores adjacent in the arrangement direction. Claim 6 An optical fiber tape core according to claim 1 or 2, wherein, in the arrangement direction, the dimensions (L1) of the first high-density region and the dimensions (L2) of the first low-density region are identical to each other, and the dimensions (L3) of the second high-density region and the dimensions (L4) of the second low-density region are identical to each other. Claim 7 An optical fiber tape core according to claim 1 or 2, wherein in the arrangement direction, the first high-density region and the second high-density region do not overlap each other. Claim 8 An optical fiber tape core according to claim 1 or 2, wherein in the arrangement direction, the first low-density region and the second low-density region do not overlap each other. Claim 9 delete

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