JP2013003516A - Method for manufacturing optical fiber ribbon, device for manufacturing optical fiber ribbon, and optical fiber ribbon - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing an optical fiber ribbon, which is capable of coping with high-speed manufacturing and intermittently bonds optical fiber strands with excellent bonding strength.SOLUTION: Optical fiber strands 3a, 3b, 3c, and 3d fed out from supply parts 11a, 11b, 11c, and 11d are sent to applying rolls 13a, 13b, 13c, and 13d. After passing the applying rolls 13a, 13b, 13c, and 13d, the optical fiber strands 3a, 3b, 3c, and 3d are arrayed adjacently to each other in parallel on one plane by an arraying part 19. The applying roll 13c has a revolving shaft substantially perpendicular to an advance direction of the optical fiber strand 3c. An adhesive member holding part 23 is formed on a part of an outer peripheral surface of the applying roll 13c. The adhesive member holding part 23 holds an adhesive member and applies the adhesive member to a side surface of the optical fiber strand 3c brought into contact with the holding member 23.

Description

  The present invention relates to an optical fiber ribbon manufacturing method in which a plurality of optical fiber strands are bonded in parallel, an optical fiber ribbon manufacturing apparatus, and an optical fiber ribbon.

  As an optical fiber for transmitting a large amount of data at a high speed, an optical fiber tape core in which a plurality of optical fiber strands are arranged in parallel and bonded is used for easy storage in a cable and work. ing. As the optical fiber ribbon, a fiber in which parallel optical fibers are fixed with a resin over the entire length is used, and there are optical fiber tapes in which optical fiber strands are intermittently bonded to each other. Intermittent bonding of optical fiber strands has features such as an increase in concentrating density, a reduction in transmission loss due to bending, and ease of single-core operation.

  As a means for applying an adhesive member for intermittently bonding optical fiber strands, one that is discharged and adhered by a dispenser (for example, Patent Document 1), one that uses a shutter mechanism (for example, Patent Document 2), etc. It has been devised. In addition, a resin that partially cures the applied resin to obtain an intermittent adhesive portion has been devised.

JP 2001-264604 A JP 2010-33010 A

  In order to obtain an optical fiber tape core wire in which optical fiber strands are intermittently bonded at an arbitrary interval, it is necessary to synchronize the speed of the optical fiber strands and the operation of resin application to the optical fiber strands. There is. Therefore, the switching speed with and without resin coating is a major factor that determines the manufacturable linear speed. For this reason, in order to manufacture an optical fiber ribbon at high speed, it is necessary to increase the switching speed.

  However, in the method as disclosed in Patent Document 1, the resin is pushed out onto the fiber strand while pressure is applied, but there is a limit speed in the switching operation of the presence or absence of pressurization by the dispenser. As you move up, you reach an area where the action of the dispenser cannot follow. Therefore, in this patent, the linear velocity is limited to 15 to 100 m / min.

  In addition, if the temperature of the resin used for tape formation is equal, the higher the viscosity of the resin, the worse the temporal response of the flow to a change in pressure. For this reason, when a high viscosity resin is used by extruding the resin to the surface of the fiber, the time difference between when the pressure on the resin in the flow path is stopped and when the resin finishes flowing increases. The time during which the resin is actually applied onto the fiber strand becomes longer with respect to time. That is, the higher the viscosity of the resin, the more difficult it is to discharge the resin in a short time.

  Similarly, even when a shutter mechanism as shown in Patent Document 2 is used, the linear speed is limited by the operating speed of the shutter.

  For example, when resin is applied from one direction perpendicular to the parallel surface by a method such as Patent Document 1, the resin is applied to a recess formed by a plurality of parallel optical fiber wires. However, in such a case, the bonding area is not sufficient for handling as a tape core, and the bonding strength is insufficient. For this reason, it is necessary to increase the resin.

  As described above, in the method of applying resin to the parallel fiber strands, it is difficult to secure a sufficient adhesion area, and it is possible to increase the adhesive strength while suppressing the cross-sectional area when it becomes a tape core wire. There is a problem that it is difficult. On the other hand, for the purpose of high-density mounting, it is desirable that the cross-sectional area of the optical fiber ribbon is small.

  The present invention has been made in view of such problems, and can provide a method for manufacturing an intermittently bonded optical fiber ribbon that can be manufactured at high speed and has excellent adhesive strength. The purpose is to do.

  In order to achieve the above-described object, the first invention is a method of manufacturing an optical fiber ribbon in which a plurality of optical fiber strands are intermittently bonded in the longitudinal direction, and an adhesive member can be held on a part of the outer periphery. An optical fiber tape core manufacturing apparatus having a plurality of application rolls having an adhesive member holding part and capable of intermittently applying the adhesive member, and an alignment part that collects and parallels a plurality of optical fiber strands A plurality of optical fiber strands were brought into contact with respective coating rolls, and an adhesive member was intermittently applied to at least the side surface of the optical fiber strand, and the adhesive member was applied to the side surface at the alignment portion. It is the manufacturing method of the optical fiber ribbon which arrange | positions so that the side surfaces of the said optical fiber strand may contact, and adheres the said optical fiber strands with the said adhesive member.

  The application roll has an outer diameter of the adhesive member holding portion larger than an outer diameter of a portion other than the adhesive member holding portion, and the application roll contacting the optical fiber strand at one end to be aligned, It is a dummy application roll, and it is desirable not to apply an adhesive member to the optical fiber wire at one end.

  The application interval of the adhesive member in the longitudinal direction of the optical fiber strand is P, the distance between the coating roll contacting the arbitrary optical fiber strand and the alignment portion is L1, and the optical fiber adjacent to the optical fiber strand It is desirable that the difference between L1 and L2 is P × (n + 0.5), where L2 is the distance between the coating roll contacting the strands and the alignment portion, and n is an integer.

  The adhesive member may be an ultraviolet curable resin, and after aligning the optical fiber strands at the alignment portion, the adhesive member may be cured by irradiating ultraviolet rays.

  Guide rolls may be provided before and after the coating roll so that the optical fiber can contact a predetermined circumference of the outer circumference of the coating roll.

  The adhesive member may have a viscosity of 0.001 Pa · s to 10 Pa · s.

  According to the first aspect, since the adhesive member is applied by the application roll, it is easy to synchronize with the linear velocity of the optical fiber.

  Moreover, since an application | coating roll apply | coats an adhesive member to the side surface of an optical fiber strand, an adhesive member is extruded to the up-down direction of a contact part at the time of the contact of the side surfaces of an optical fiber strand. For this reason, resin exists in both of a pair of groove | channel which the optical fiber strand after alignment forms, and it can adhere | attach on the upper and lower sides of an optical fiber strand. Therefore, compared with the case where it applies only from one side, it is excellent in the adhesive strength of optical fiber strands. That is, even if the application amount of the adhesive member used for adhesion is small, it is possible to obtain an adhesive strength equivalent to that of the conventional technique.

  Moreover, an adhesive member can be apply | coated on an optical fiber strand from an application roll, without utilizing the flow of the adhesive member by pressurization. For this reason, it becomes possible to manufacture at a high speed regardless of the viscosity of the adhesive member.

  Moreover, since the outer diameter of the adhesive member holding part of the application roll is larger than the outer diameter of the part other than the adhesive member holding part, the adhesive member can be reliably applied to the optical fiber. In addition, it is not necessary to apply an adhesive member to the optical fiber strand at one end to be aligned, but since the coating roll that comes into contact is a dummy coating roll, for all the fiber strands, It can be brought into contact with the adhesive member holding portion having a large outer diameter. For this reason, the same pulsation accompanying a change in outer diameter can be given to all the optical fiber strands.

  Moreover, the adhesion part of optical fiber strands can be arrange | positioned in zigzag by making the difference of the distance from the application roll of the adjacent optical fiber strands to an alignment part into Px (n + 0.5). At this time, all the optical fiber strands can be brought into contact with the adhesive member holding portion at the same timing. For this reason, the pulsation accompanying this can be provided at the same timing.

  Further, by using an ultraviolet curable resin as an adhesive member and irradiating ultraviolet rays after aligning the optical fiber strands at the alignment portion and curing the adhesive member, the optical fiber strands can be reliably bonded to each other.

  Further, by providing a guide roll before and after the coating roll so that the optical fiber strand can contact a predetermined circumference of the outer circumference of the coating roll, the coating roll can be rotated by the movement of the optical fiber strand. it can. That is, by using a coating roll that obtains power by friction with a traveling optical fiber, the linear speed during manufacturing is not limited by the followability of the resin coating mechanism and can be manufactured at high speed.

  Further, if the viscosity of the adhesive member is 0.001 Pa · s to 10 Pa · s, the adhesive can be reliably held and applied by the adhesive holding portion, and coupled with the effect of the guide roll described above, The coating roll can be reliably rotated by the optical fiber.

  The second invention is an optical fiber tape manufacturing apparatus for intermittently bonding a plurality of optical fiber strands in the longitudinal direction, and has an adhesive member holding portion capable of holding an adhesive member on a part of the outer periphery, A plurality of application rolls capable of intermittently applying the adhesive member, and an aligning portion in which a plurality of optical fiber strands are assembled and arranged in parallel, wherein the application roll has an outer diameter of the adhesive member holding portion, The coating roll that is larger than the outer diameter of the part other than the adhesive member holding portion and contacts the optical fiber wire at one end to be aligned is a dummy coating roll that does not apply the adhesive member, and other than the dummy coating roll The coating roll can intermittently apply the adhesive member to at least the side surface of the optical fiber that is in contact with the coating roll, the application interval of the adhesive member in the longitudinal direction of the optical fiber is P, and any optical fiber Touch the line When the distance between the coating roll and the alignment portion is L1, the distance between the coating roll contacting the optical fiber strand adjacent to the optical fiber strand and the alignment portion is L2, and n is an integer, L1 And L2 is P × (n + 0.5), which is an apparatus for manufacturing an optical fiber ribbon.

  According to the second invention, the optical fiber ribbon can be manufactured at a high speed, and the bonded portions can be intermittently formed in a staggered manner, and the optical fiber strands can be bonded with high adhesive strength.

  3rd invention is the optical fiber tape core wire manufactured with the manufacturing method of the optical fiber tape core wire concerning 1st invention, Comprising: The adhesion part of adjacent optical fiber strands is formed in zigzag form, In the bonding portion, an adhesive member is provided on both the upper surface side and the lower surface side of the optical fiber tape core wire.

  According to the third invention, since the optical fibers are bonded with high adhesive strength, it is possible to obtain an optical fiber tape core wire having a small cross-sectional area when it becomes a tape core wire.

  According to the present invention, it is possible to provide a method for manufacturing an intermittently bonded optical fiber ribbon that can be applied to high-speed manufacturing and has excellent adhesive strength.

The perspective view which shows the optical fiber tape core wire 1. FIG. It is a figure which shows the optical fiber tape core wire 1, (a) is a top view, (b) is the sectional view on the AA line of (a). Schematic which shows the structure of the optical fiber tape cable manufacturing apparatus 10. FIG. The figure which shows the distance of each application roll and the alignment part 19. FIG. (A) is the D section enlarged view of FIG. 3, (b) is the MM sectional view taken on the line of (a). (A) is the J section enlarged view of FIG. 5, (b) is the K section enlarged view of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an optical fiber ribbon 1. 2 is a view showing the optical fiber ribbon 1, FIG. 2 (a) is a plan view, and FIG. 2 (b) is a cross-sectional view taken along line AA in FIG. 2 (a). The optical fiber ribbon 1 is configured by bonding a plurality of optical fiber strands 3a, 3b, 3c, and 3d in parallel. In the following description, an example constituted by four optical fiber strands 3a, 3b, 3c, 3d is shown, but the present invention is not limited to this, and an optical fiber tape core comprising a plurality of optical fiber strands. Any wire can be applied.

  In the optical fiber ribbon 1, adjacent optical fiber strands 3 a, 3 b, 3 c, 3 d are bonded by an adhesive member 5 intermittently at a predetermined interval. Adhering portions between adjacent optical fiber strands are arranged in a staggered manner with respect to the longitudinal direction of the optical fiber ribbon 1.

  That is, as shown in FIG. 2A, the bonding position between the fiber strands 3b and 3c with respect to the longitudinal direction of the optical fiber ribbon 1 is set between the adjacent fiber strands 3a and 3b and between the fiber strands 3c and 3d. They are formed at the same pitch with a substantially half-pitch deviation from the bonding position between them. Therefore, the bonding position between the fiber strands 3a and 3b and the bonding position between the fiber strands 3c and 3d are the same position.

  Here, when the length in the longitudinal direction to which the adhesive member 5 is applied is B and the coating pitch in the longitudinal direction of the adhesive member 5 is P, the distance between all adjacent optical fiber strands 3a, 3b, 3c, 3d B and P are the same, and as described above, only the positions of the adjacent adhesive members 5 are shifted by a half pitch. The coating length B is, for example, about 50 mm, and the coating pitch P may be about 150 mm. Therefore, the non-application length in this case is about 100 mm.

  Moreover, as shown in FIG.2 (b), the adhesive member 5 is exposed to the upper and lower groove parts of the contact part of optical fiber strands. That is, the adjacent optical fiber strands 3 a, 3 b, 3 c, 3 d are bonded on the upper and lower surfaces of the optical fiber ribbon 1.

  Next, a method for manufacturing the optical fiber ribbon 1 will be described. FIG. 3 is a schematic diagram showing the configuration of the optical fiber ribbon manufacturing apparatus 10. The optical fiber ribbon manufacturing apparatus 10 mainly includes supply units 11a, 11b, 11c, and 11d, coating rolls 13a, 13b, 13c, and 13d, an alignment unit 19, an ultraviolet irradiation unit 21, and the like. In addition, you may install the guide etc. which abbreviate | omitted illustration suitably so that the optical fiber strands 3a, 3b, 3c, and 3d may pass along an appropriate course.

  Supply part 11a, 11b, 11c, 11d is a site | part which supplies optical fiber strand 3a, 3b, 3c, 3d, respectively. Supply part 11a, 11b, 11c, 11d is a bobbin, for example. The optical fiber strands 3a, 3b, 3c and 3d are fed out with a predetermined tension while rotating the bobbin around which the optical fiber strands 3a, 3b, 3c and 3d are wound.

  The optical fiber strands 3a, 3b, 3c, and 3d fed from the supply units 11a, 11b, 11c, and 11d are respectively sent to the coating rolls 13a, 13b, 13c, and 13d. Details of the coating rolls 13a, 13b, 13c, and 13d will be described later.

  The optical fiber strands 3a, 3b, 3c, and 3d that have passed through the coating rolls 13a, 13b, 13c, and 13d are juxtaposed in the alignment unit 19 so as to be adjacent to each other on the same plane. For example, a metal die can be applied to the alignment unit 19. A taper portion is formed inside the alignment portion 19 so as to become narrower from the introduction side of the optical fiber strands 3a, 3b, 3c, and 3d toward the concentrating portion. The distance between the optical fiber strands 3a, 3b, 3c, and 3d at the concentrator may be about 20 μm.

  If the application amount of the adhesive member to be described later is constant, the optical fiber strands 3a, 3b, 3d, 3d are changed by changing the distance between the optical fiber strands 3a, 3b, 3c, 3d at the concentrating portion of the alignment portion 19. The adhesion area between 3b, 3c and 3d can be adjusted, and the adhesion strength can be changed.

  Furthermore, when an ultraviolet curable resin is used as the adhesive member, the adhesive member applied by the application roll is cured by the ultraviolet irradiation unit 21. The optical fiber ribbon 1 manufactured as described above is wound up by winding means or the like (not shown). In addition, what is necessary is just to set it as about 50-500 m / min as linear velocity of the fiber tape core wire 1, for example.

  FIG. 4 is a view showing the arrangement of the application rolls 13a, 13b, 13c, 13d and the alignment unit 19. As shown in FIG. When the distances from the coating rolls 13a, 13b, 13c, and 13d to the alignment unit 19 are L1 to L4, the distances from the coating rolls corresponding to the adjacent optical fiber strands 3a, 3b, 3c, and 3d to the alignment unit are as follows. The difference is constituted by a coating pitch P × (n + 0.5) (n is an integer). That is, the difference in length between L1 and L2 (or the difference in length between L2 and L3 or the difference in length between L3 and L4) is arranged to be different by the coating pitch P × (n + 0.5).

  FIG. 5 is a view showing the vicinity of the coating roll, and is an enlarged view of a part D in FIG. 3. In addition, although the structure about the example of the application roll 13c vicinity is demonstrated in the following description, it is the same structure also about another application roll unless there is particular description.

  The coating roll 13c is a roll having a rotation axis substantially perpendicular to the traveling direction of the optical fiber 3c. An adhesive member holding portion 23 is formed on a part of the outer peripheral surface of the application roll 13c. The adhesive member holding portion 23 is a part that holds the adhesive member and applies the adhesive member to the side surface of the optical fiber 3c that comes into contact.

  That is, the circumferential length of the adhesive member holding portion 23 in the application roll 13c substantially matches the application length B of the adhesive member (FIG. 2A). Moreover, the installation pitch of the adhesive member holding part 23 in the application roll 13c is substantially the same as the application pitch P (FIG. 2A). For this reason, the outer peripheral length of the application roll 13c is set to be an integral multiple of the application pitch P (the example is twice in the figure). For example, in the above-described example, the adhesive member holding portions 23 having a circumferential length of 50 mm may be formed with an interval of 100 mm.

  The adhesive member holding portion 23 is preferably made of felt, rubber, sponge, etc. that can easily hold the adhesive member, and for example, urethane rubber can be used.

  In addition, in the outer peripheral surface of the application roll 13c, the adhesive member holding part 23 is formed so as to protrude in the radial direction from other portions. In other words, the outer diameter of the adhesive member holding portion 23 is larger than the outer diameter other than the adhesive member holding portion 23.

  A pair of guide rolls 17 is provided on the side of the coating roll 13c (before and after the traveling direction of the optical fiber 3c). The guide roll 17 is a roll having the same axis of rotation as the application roll 13c. Depending on the position of the guide roll 17, the holding angle (contact length) of the optical fiber 3c with respect to the coating roll 13c can be adjusted.

  Here, the application roll 13c and the guide roll 17 do not have independent rotation drive mechanisms. Therefore, the coating roll 13c rotates with the movement of the optical fiber 3c as a driving force by the frictional force generated by the contact with the optical fiber 3c (in the direction of arrow F in the figure). Therefore, if the contact area between the optical fiber 3c and the coating roll 13c is too small, the coating roll 13c slides with respect to the optical fiber 3c, and the application of the adhesive member to the optical fiber 3c is performed as set. I will not be broken. For this reason, the holding angle (contact length) of the optical fiber 3c with respect to the coating roll 13c is adjusted by the guide roll 17 so that a contact area between the optical fiber 3c and the coating roll 13c exceeding a predetermined value can be obtained.

  In addition, if the force for rotating the coating roll 13c is obtained by the adhesive member holding part 23 from the optical fiber strand 3c (in the direction of arrows E and I in the figure) that travels through the adhesive member, the adhesive member holding part The force F generated between the optical fiber strand 3c and the optical fiber strand 3c is expressed as follows: the viscosity η of the adhesive member, the area of the optical fiber strand 3c facing the adhesive member holding portion 23 (hereinafter referred to as the contact area at the end) The relative speed between the surface of the member holding part 23 and the surface of the optical fiber 3c is represented by v, and the thickness w of the adhesive member between the adhesive member holding part 23 and the optical fiber 3c is expressed as F = ηSv / w. be able to.

Here, as the relative speed v increases (the slip increases), the application pitch of the adhesive member becomes larger than the design value. For this reason, there is an allowable value v _max for v. In the manufacture of the optical fiber ribbon 1 at a constant linear velocity, the force F required to rotate the coating roll 13c is determined by the apparatus configuration such as roll mass and bearing resistance, and the adhesive member thickness w is constant. Then, the minimum contact area S _min required when using an adhesive member having a specific viscosity is expressed as S _min = F · w / ηv _max .

  That is, the necessary contact area between the adhesive member holding portion 23 and the optical fiber 3c varies depending on the viscosity of the adhesive member to be used. In the present embodiment, the holding angle r of the optical fiber strand to the coating roll 13c (the angle at which the optical fiber strand 3c is in contact with the center of the coating roll 13c) is appropriately adjusted depending on the position of the guide roll 17. be able to. It is desirable that the holding angle r is 120 ° or more. This is to secure a necessary contact area and suppress slippage of the optical fiber 3c when an adhesive member in a usable range described later is used.

  Moreover, when the application roll 13c mainly obtains rotational force from the adhesive member holding part 23, it is desirable to always ensure a contact area between the adhesive member holding part 23 and the optical fiber 3c. That is, it is desirable that r / 2π> C / L, where the holding angle r (rad), the non-application portion is C, and the outer peripheral length of the application roll 13c is L.

  For example, in this embodiment, C = 100 mm (P = 150 mm, B = 50 mm (FIG. 2A)), and two holding members 23 are provided on the application roll 13c, so that the holding angle is 120. The contact surface is always secured in the range larger than °. Thus, it is desirable to set the number of repetitions of the adhesive member holding portion 23 to the coating roll 13c, the holding angle, and the like so that the adhesive member holding portion 23 and the optical fiber 3c are always in contact with each other.

  An adhesive member supply unit 15 is disposed in the vicinity of the application roll 13c. The adhesive member supply unit 15 is a part that supplies an adhesive member to the adhesive member holding unit 23 of the application roll 13c. The adhesive member supply unit 15 is provided with an adhesive member supply roll 25 having a rotation axis in the same axial direction as the rotation axis of the application roll 13c.

  The outer peripheral surface of the adhesive member supply roll 25 is disposed so as to contact only the adhesive member holding portion 23 of the application roll 13c. Therefore, the adhesive member supply roll 25 rotates by contact with the adhesive member holding part 23 (in the direction of arrow G in the figure). That is, the adhesive member attached to the outer periphery of the adhesive member supply roll 25 is transferred only to the adhesive member holding part 23 of the application roll 13c, and the adhesive member does not adhere to any part other than the adhesive member holding part 23.

  In addition, as for the viscosity by JISZ8803 of the adhesive member before hardening, it is desirable to set it as 0.001-10Pa * s. When the viscosity of the adhesive member is less than 0.001 Pa · s, the transfer amount to the optical fiber strand is reduced, and the adhesive strength is greatly reduced. Further, when the viscosity of the adhesive member is larger than 10 Pa · s, the viscosity is too high, and the adhesive member is not transferred from the coating roll to the optical fiber strand, so that the bonding becomes impossible.

  As described above, an ultraviolet curable resin can be used as the adhesive member, but other adhesives, resins, and the like can also be used. In this embodiment, an example in which an ultraviolet curable resin is used as an adhesive member will be described.

  As described above, the optical fiber 3c supplied from the supply unit 11c (FIG. 3) (in the direction of arrow E in the figure) contacts the outer periphery of the coating roll 13c via the guide roll 17 at a predetermined holding angle. At this time, the adhesive member 5 is applied to the side surface of the optical fiber 3 c at a portion in contact with the adhesive member holding portion 23.

  The optical fiber 3c coated with the adhesive member 5 moves away from the coating roll 13c and moves in the direction of the alignment portion via the guide roll 17 (in the direction of arrow I in the figure).

FIG.5 (b) is the MM sectional view taken on the line of Fig.5 (a). The adhesive member 5 applied from the application roll 13c adheres to one side surface of the optical fiber 3c. By bringing the side surfaces of adjacent optical fiber strands into contact with each other in this state, the adhesive member 5 is pushed out to the upper and lower groove portions of the optical fiber strands in parallel. Therefore, the adhesive member can be attached to the upper and lower surfaces of the fiber strands.
In addition, as shown in FIG.5 (c), you may apply | coat so that the adhesive member 5 may adhere to the both sides | surfaces of the optical fiber strand 3c. In this case, a coating roll that contacts the side surface opposite to the side surface of the optical fiber strand 3c that contacts the coating roll 13c may be further provided on the path of the optical fiber strand 3c. In this case, the adhesive member 5 is applied to both side surfaces of the optical fiber strands 3b and 3c to which the optical fiber strands are bonded on both sides, and the optical fiber strands 3a and 3d on both ends are connected to each other. The adhesive member 5 may be applied only to the side to be bonded to the line.

  FIG. 6A is an enlarged view of a portion J in FIG. As described above, the adhesive member supply roll 25 contacts only the adhesive member holding portion 23 of the application roll 13c. A predetermined amount of adhesive member is always supplied to the outer peripheral surface of the adhesive member supply roll 25 (in the direction of arrow H in the figure). For this reason, the adhesive member supply roll 25 rotates while being in contact with the adhesive member holding part 23, and transfers the adhesive member attached to its outer peripheral surface to the adhesive member holding part 23.

  Here, the application rolls 13b, 13c, and 13d are provided with such an adhesive member supply roll 25 (adhesive member supply section 15), and an adhesive member is supplied to each of the application rolls 13b, 13c, and 13d. The application roll 13a corresponding to 3a is not provided with the adhesive member supply roll 25 (adhesive member supply section 15). Therefore, although the adhesive member holding | maintenance part 23 is formed in the application | coating roll 13a, the adhesive member itself is not supplied but it becomes the application | coating roll of a dummy adhesive member.

  FIG. 6B is an enlarged view of a portion K in FIG. As described above, the coating roll 13c comes into contact with the optical fiber 3c and rotates by the movement of the optical fiber 3c (in the direction of arrow F in the figure). At this time, the side surface of the optical fiber 3c to which a predetermined tension is applied is pressed against the outer peripheral surface of the coating roll 13c, but the outer diameter of the position of the adhesive member holding portion 23 is outside the other position. Since the diameter is larger than the diameter, a step 29 is formed on the contact surface between the optical fiber 3c and the coating roll 13c at the boundary between the adhesive member holding portion 23 and another portion.

  Therefore, the optical fiber 3c in contact with the outer periphery of the application roll 13c periodically gets over the step 29. For this reason, periodic pulsation occurs in the traveling direction of the optical fiber 3c.

  If such pulsation occurs in each fiber strand, the rear alignment portion 19 and the ultraviolet irradiation portion 21 may cause a slight shift between the fiber strands.

  On the other hand, in the present invention, the dummy application roll 13a is brought into contact with the optical fiber strand 3a at the extreme end which is originally unnecessary. For this reason, the pulsation by the coating roll 13a can be given also to the optical fiber 3a which does not require an adhesive member.

  Further, the difference in distance between the adjacent coating rolls 13a, 13b, 13c, 13d and the alignment portion 19 is set to be a coating pitch P × (n + 0.5) (n is an integer). For this reason, even if the adhesive portions are formed with a staggered half-pitch shift in the longitudinal direction, the positions of the application rolls are shifted by a half-pitch, so that the timing of pulsation generated in each fiber strand can be matched.

  As described above, according to the present invention, since the coating roll is rotated by the optical fiber strand, it is easy to synchronize with the linear velocity of the optical fiber strand, and it is possible to cope with a high linear velocity. Moreover, since an application | coating roll apply | coats an adhesive member to the side surface of an optical fiber strand, it can adhere | attach on the upper and lower sides of an adjacent optical fiber strand.

  Further, by providing the guide roll, a sufficient contact area between the coating roll and the optical fiber can be taken. For this reason, an optical fiber strand does not slip with respect to a coating roll.

  In addition, it is not necessary to apply an adhesive member to the optical fiber strand at one end to be aligned, but since the coating roll that comes into contact is a dummy coating roll, for all the fiber strands, The same pulsation can be given. For this reason, there is no fear of deviation due to the presence or absence of pulsation.

  In addition, by setting the distance from the coating roll between adjacent optical fiber strands to the alignment portion as P × (n + 0.5), the adhesive portions between the optical fiber strands can be arranged in a staggered manner, as described above. The timing of occurrence of pulsation can be aligned.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

DESCRIPTION OF SYMBOLS 1 ... Optical fiber ribbon 3a, 3b, 3c, 3d ... Optical fiber 5 ... Adhesive member 10 ... Optical fiber ribbon manufacturing apparatus 11a, 11b, 11c, 11d ... Supply unit 13a, 13b, 13c, 13d ......... Coating roll 15 ......... Adhesive member supply unit 17 ......... Guide roll 19 ...... Alignment unit 21 ...... UV irradiation unit 23 ...... Adhesive member holding unit 25 ……… Adhesive member supply roll 29 ………… Step

Claims (8)

A method of manufacturing an optical fiber ribbon in which a plurality of optical fibers are intermittently bonded in a longitudinal direction,
A plurality of application rolls having an adhesive member holding portion capable of holding the adhesive member on a part of the outer periphery, and capable of intermittently applying the adhesive member;
An alignment unit that collects and parallels a plurality of optical fiber strands;
Using an optical fiber ribbon manufacturing apparatus having
A plurality of optical fiber strands are brought into contact with the respective coating rolls, and at least a side surface of the optical fiber strand is intermittently coated with an adhesive member,
In the alignment portion, the side surfaces of the optical fiber strands coated with adhesive members on the side surfaces are aligned with each other,
A method of manufacturing an optical fiber ribbon, comprising bonding the optical fiber strands with the adhesive member. The application roll has an outer diameter of the adhesive member holding portion larger than an outer diameter of a portion other than the adhesive member holding portion,
The coating roll that contacts the optical fiber strand at one end to be aligned is a dummy coating roll, and an adhesive member is not applied to the optical fiber strand at one end. The manufacturing method of the optical fiber tape core wire of Claim 1. The application interval of the adhesive member in the longitudinal direction of the optical fiber strand is P, the distance between the coating roll contacting the arbitrary optical fiber strand and the alignment portion is L1, and the optical fiber adjacent to the optical fiber strand When the distance between the coating roll contacting the strand and the alignment portion is L2, and n is an integer,
The method of manufacturing an optical fiber ribbon according to claim 1 or 2, wherein a difference between L1 and L2 is P × (n + 0.5).   4. The adhesive member according to claim 1, wherein the adhesive member is an ultraviolet curable resin, and the optical fiber strands are aligned at the alignment portion, and then the ultraviolet light is irradiated to cure the adhesive member. A method of manufacturing the optical fiber ribbon according to claim 1.   The guide roll is provided before and after the coating roll so that the optical fiber can come into contact with a predetermined circumference of the outer circumference of the coating roll. The manufacturing method of the optical fiber tape core wire of description.   6. The method for manufacturing an optical fiber ribbon according to claim 1, wherein the adhesive member has a viscosity of 0.001 Pa · s to 10 Pa · s. An optical fiber tape manufacturing apparatus for intermittently bonding a plurality of optical fiber strands in the longitudinal direction,
A plurality of application rolls having an adhesive member holding portion capable of holding the adhesive member on a part of the outer periphery, and capable of intermittently applying the adhesive member;
An alignment unit that collects and parallels a plurality of optical fiber strands;
Comprising
The application roll has an outer diameter of the adhesive member holding portion larger than an outer diameter of a portion other than the adhesive member holding portion,
The coating roll that contacts the optical fiber strand at one end to be aligned is a dummy coating roll that does not apply an adhesive member,
The coating rolls other than the dummy coating roll can intermittently apply the adhesive member to at least the side surface of the optical fiber that is in contact with the application roll.
The application interval of the adhesive member in the longitudinal direction of the optical fiber strand is P, the distance between the coating roll contacting the arbitrary optical fiber strand and the alignment portion is L1, and the optical fiber adjacent to the optical fiber strand When the distance between the coating roll contacting the strand and the alignment portion is L2, and n is an integer,
An apparatus for manufacturing an optical fiber ribbon, wherein a difference between L1 and L2 is P × (n + 0.5).   An optical fiber tape core manufactured by the method for manufacturing an optical fiber ribbon according to any one of claims 1 to 6, wherein adhesive portions between adjacent optical fiber strands are formed in a staggered pattern. In the bonding portion, an adhesive member is provided on both the upper surface side and the lower surface side of the optical fiber ribbon.

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