JP2015010031A - Optical fiber terminal fixing tool for taking up optical fiber, and optical fiber taking up method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical fiber taking up and fixing tool capable of automating an operation for winding an optical fiber around a take-up part with narrow width.SOLUTION: A fixing tool comprises a disc-like substrate. A holding face for holding a terminal portion of a fiber between it and a collar part outside a bobbin is provided on a disc plane of the disc-like substrate, and a protrusion part projecting toward the bobbin is formed at one part on an outer peripheral side of the disc plane of the disc-like substrate. In a taking up method, a winding start side terminal portion of the fiber is held and fixed between a holding face of the fixing tool and an outer collar part of the bobbin, and one part of the fiber is pressed toward the bobbin by the protrusion part. The fixing tool and the bobbin are integrally rotated, so as to make the fiber ride over the collar part for taking up the take up part.

Description

  The present invention relates to an optical fiber for fixing an optical fiber winding start terminal to a bobbin when winding an optical fiber around a winding portion between the flange portions of an optical fiber winding bobbin having a flange portion. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal fixture and a method for winding an optical fiber around a bobbin using the fixture, and in particular, an optical fiber terminal fixture suitable for guiding an optical fiber having a terminal fixed to a bobbin onto a winding unit. , And a winding method using the same.

  In an optical fiber manufacturing process, an optical fiber core manufacturing process, and the like, an optical fiber core or an optical fiber core (in the present specification, these are collectively referred to as an optical fiber) and an optical fiber on a bobbin. Is taken up. As the bobbin, using a cylindrical winding part (so-called winding drum) with hooks provided at both ends, the bobbin is mounted on a winder, and the tip of the optical fiber to be wound is The optical fiber is fixed to the bobbin or a part that rotates integrally with the bobbin, and is rotated on the outer peripheral surface of the winding part (winding drum) between the flanges by rotating the bobbin while applying tension (winding tension) to the optical fiber. It is usual to wind up.

  Here, when starting the winding of the optical fiber, it is necessary to fix the tip portion of the optical fiber to be wound as described above to a bobbin or a part that rotates integrally with the bobbin. The bobbin is usually sandwiched between the outer surface of the flange on one end side and the surface on the winder side facing it. In this case, since the end of the optical fiber is fixed to the outer surface side of the flange, in order to wind the optical fiber around the winding portion inside the flange, the optical fiber is wound at the initial stage of winding. It is necessary to go over the collar from the outer surface side of the part and drop (introduce) it onto the outer peripheral surface of the inner winding part.

  As a conventional method for fixing the end of the optical fiber on the outer surface side of the collar part in this way and introducing the optical fiber to the outer peripheral surface of the winding part inside the collar part, particularly as a method for automatically introducing the optical fiber. For example, the method disclosed in Patent Document 1 is widely adopted. This conventional method is schematically shown in FIGS.

  22 and 23, the bobbin 1 has a configuration in which flanges 5A and 5B having a diameter larger than the outer diameter of the winding drum 3 are formed at both ends of a cylindrical winding drum (winding portion) 3. Yes. On the other hand, the rotary shaft 7 of the winder is provided with a disk-shaped fixed plate 9 that rotates integrally with the rotary shaft 7. The bobbin 1 is mounted on the rotary shaft 7 of the winder so that the outer surface of the flange portion 5A faces the surface of the fixed plate 9. On the other hand, the optical fiber 11 is supplied toward the bobbin 1 through a guide roller 13 such as a traverser. However, before the winding is started (before the bobbin starts rotating), the tip of the optical fiber 11 to be wound is removed. It fixes between the fixed platen 9 and the collar part 5A. On the other hand, a laterally moving member 15 for restricting the traveling position of the optical fiber 11 supplied to the bobbin 1 from the traverser guide roller 13 is arranged near the outer peripheral side of the flange portion 5A. The member 15 is moved in parallel with the rotation axis of the bobbin 1 toward the other flange portion 5B, whereby the optical fiber 11 is moved over the flange portion 5A and dropped onto the outer periphery of the winding drum 3. In addition, as shown in FIG. 24, an introduction groove 17 that is notched inward from the outer peripheral edge portion is formed in the outer peripheral portion of the flange portion 5A, and the optical fiber 11 that is laterally moved by the lateral movement member 15 is formed. Is allowed to fall into the introduction groove 17 from the outer peripheral surface 5Aa of the flange portion 5A, and thereby can be dropped onto the outer peripheral surface of the winding drum 3 inside the flange portion 5A.

  Incidentally, a bobbin 20 as shown in FIG. 25 may be used in an optical fiber manufacturing process or the like. The bobbin 20 has a short cylindrical first winding portion (hereinafter referred to as a narrow winding portion; generally, the width W1 is about several mm) 21 having a very narrow width W1 in the direction along the rotation axis. A cylindrical second winding portion (hereinafter referred to as a wide winding portion) whose width W2 in the direction along the rotation axis is much wider than the width W1 of the narrow winding portion 21; 10 mm or more) 23 are integrated in series with the intermediate flange 25B as a boundary. That is, the narrow winding portion 21 includes a first flange portion 25A located on one end side of the entire bobbin 20 (one end side in the direction along the rotation axis) and the intermediate flange portion (second flange portion) 25B. The wide winding portion 23 is formed between the third flange portion 25C located on the other end side of the bobbin 20 and the intermediate flange portion (second flange portion) 25B. Has been. The diameter d1 of the first flange portion 25A on the outside of the narrow winding portion 21 is equal to the flange portions (the second flange portion (intermediate flange portion) 25B and the outer third flange portion) on both sides of the wide winding portion 21. The diameter is smaller than the diameter d2 of the outer flange 25C).

  Such a narrow winding portion 21 of the bobbin 20 is usually used for winding a portion for measuring characteristics in the optical fiber. That is, in the initial stage after the start of winding, a short part (about several meters) on the end side of the optical fiber is wound around the narrow winding part 21 and then most of the remaining optical fiber is wound into the wide winding part 23. It is wound up into a long length. And in order to measure the characteristic of the optical fiber wound up by the bobbin, the part wound up by the narrow winding part 21 is generally utilized.

As described above, when the optical fiber is wound around the winding portion 21 having an extremely narrow width, when the conventional method shown in FIGS. 22 to 24 is applied, the winding is actually difficult. There are many. The reason will be described with reference to FIG.
That is, even if the lateral movement member 15 located on the outer peripheral side of the second large collar part (intermediate collar part) 25B is moved in the direction of the arrow 26 and the optical fiber 11 is pushed, the optical fiber 11 is second. The optical fiber 11 comes into contact with the corner portion of the second flange portion 25 before entering a state where it can move over the flange portion 25B (a state in which the angle with respect to the second flange portion 25B becomes a certain level or more) ( 26, the optical fiber 11 moves further between the small-diameter first flange portion 25 and the large-diameter second flange portion 25B. This is because the optical fiber 11 cannot be dropped into the narrow winding portion 21 between the outer first flange portion 25A and the intermediate second flange portion 25B.

  Therefore, when the optical fiber 11 is wound around the narrow winding portion 21 using the bobbin 20 having the narrow winding portion 21 as shown in FIG. 25, the end of the optical fiber 11 is connected to the second flange portion 25B. Through a through hole for passing a fiber formed in the base end portion of the wire or a slit (not shown) formed along the radial direction of the second flange portion 25B, leading to the narrow winding portion 21 and manually Thus, after the optical fiber 11 was wound around the narrow winding portion 23, the end of the optical fiber 11 had to be fixed. That is, although the fixing work of the end of the optical fiber 11 and the winding work around the wide winding part 21 can be automated, the winding around the narrow winding part 21 cannot be automated, which is This was a major bottleneck in labor saving and productivity improvement by fully automated fiber winding.

  In addition, in the above place, the 1st winding part (narrow winding part) 21 of the very small width W1 and the 2nd winding part (wide winding part) of the big width W2 in one bobbin 20 However, even if the bobbin has only one winding portion, the same problem as described above occurs when the width of the winding portion is extremely narrow. there is a possibility.

JP 2000-72329 A

  The present invention has been made against the background described above. When starting to wind an optical fiber around a bobbin, the optical fiber terminal is simply used as a fixture for fixing the end of the optical fiber to the outer surface side of the bobbin collar. In addition to pinching the end of the fiber, even in the case of a bobbin having a narrow winding portion, an optical fiber terminal fixture is provided that has a function of introducing an optical fiber into the narrow winding portion, In addition, an optical fiber winding method capable of easily and surely introducing an optical fiber into a narrow winding portion by winding using the optical fiber terminal fixture is provided. Optical fiber winding work for narrow winding parts can be automated without manual operation, saving labor for winding work using bobbins with narrow winding parts It is an object of the present invention possible to achieve the efficiency improvement.

  Basically, the present invention relates to a fixing tool for fixing and holding the end of the optical fiber on the outer flange of the bobbin, that is, a member corresponding to the fixing plate 9 shown in FIG. It has been found that by changing its shape from the conventional one, the fixture can be provided with a function of easily and surely introducing an optical fiber into a narrow winding portion.

That is, an optical fiber terminal fixture for winding an optical fiber according to the basic aspect (first aspect) of the present invention is:
A terminal portion on the winding start side of the optical fiber to be wound is sandwiched between the outer periphery of the optical fiber winding bobbin and attached to the rotary shaft of the winder, and the terminal portion is An optical fiber terminal fixing tool for winding an optical fiber for fixing, and a combination with an optical fiber winding bobbin in which a fiber introduction groove is formed in a part of the outer peripheral edge of the first flange In an optical fiber terminal fixture for use in
It consists of a base that forms a disc shape as a whole,
And the disk surface of the disk-shaped substrate has a clamping surface that sandwiches the end portion of the optical fiber with the first flange of the bobbin,
Further, a part of the outer peripheral side of the disk surface on the bobbin side of the disk-shaped substrate is formed with a raised portion that protrudes toward the bobbin and at least a part is inserted into the fiber introduction groove. To do.

An optical fiber terminal fixture for winding an optical fiber according to the second aspect of the present invention is the optical fiber terminal fixture of the first aspect.
The distance from the central axis position of the disc-shaped substrate to the rising proximal end of the raised portion on the side of the central axis position is smaller than the radius of the first flange portion of the bobbin, and the fiber is introduced from the central axis position of the bobbin. It is determined to be larger than the distance to the bottom of the groove, and the length of the raised portion in the circumferential direction of the disc-shaped substrate is determined to be smaller than the length of the fiber introduction groove in the circumferential direction of the first flange portion. Is.

Furthermore, the optical fiber terminal fixture for winding an optical fiber according to the third aspect of the present invention is the optical fiber terminal fixture of the first or second aspect,
The cross-sectional shape of the raised portion in the radial direction of the disk-shaped substrate is substantially triangular.

  The fourth to eighth aspects of the present invention are aspects of an optical fiber winding method using the above-described optical fiber terminal fixture.

That is, the optical fiber winding method according to the fourth aspect of the present invention is:
The first winding between the optical fiber terminal fixture according to any one of the first to third aspects and the first flange and the second flange adjacent to the first flange. A bobbin in which a part is defined and a fiber introduction groove is formed in a part of the outer peripheral edge of the first flange part,
The end portion on the winding start side of the optical fiber is fixed by being sandwiched between the holding surface of the optical fiber terminal fixture and the first flange of the bobbin, and a part of the optical fiber is fixed to the raised portion The optical fiber terminal fixture and the bobbin are then rotated together by pushing them toward the bobbin side, and a part of the optical fiber is separated from the outer surface of the raised portion of the optical fiber terminal fixture and the first flange portion. The optical fiber is introduced into the first winding portion inside the first flange through the gap between the inner edge surface of the optical fiber introduction groove and the optical fiber is wound around the first winding portion. It is what.

An optical fiber winding method according to the fifth aspect of the present invention includes:
The first winding between the optical fiber terminal fixture according to any one of the first to third aspects and the first flange and the second flange adjacent to the first flange. A bobbin in which a part is defined and a fiber introduction groove is formed in a part of the outer peripheral edge of the first flange part,
A terminal portion on the winding start side of the optical fiber is fixed by being sandwiched between the holding surface of the optical fiber terminal fixture and the first flange of the bobbin, and the optical fiber terminal fixture and the bobbin are integrated. By rotating and dropping a part of the optical fiber into the gap between the outer surface of the raised portion of the optical fiber terminal fixture and the inner edge surface of the optical fiber introduction groove of the first flange portion, The first winding portion is introduced into the first winding portion inside the collar portion, and the optical fiber is wound around the first winding portion.

Furthermore, the optical fiber winding method according to the sixth aspect of the present invention is the optical fiber winding method according to the fourth or fifth aspect,
The dimensions of each part of the bobbin and the optical fiber terminal fixture,
A: width of the first winding part of the bobbin,
B: the thickness of the first flange of the bobbin,
C ₁ : the height of the first buttocks of the bobbin,
C ₂ : depth of the introduction groove of the first flange of the bobbin,
R: radius of curvature of the chamfered portion when the side edge of the introduction groove is chamfered (however, including R = 0),
D: Height from the extended surface of the clamping surface to the top of the raised portion in the optical fiber terminal fixture,
E: distance from the outer peripheral edge of the first flange of the bobbin to the top of the raised portion of the optical fiber terminal fixture in the radial direction of the bobbin and the optical fiber terminal fixture;
L: an interval between the first flange and the second flange in a direction parallel to the rotation axis of the bobbin,
The dimensions of each part of the bobbin and the optical fiber terminal fixture are determined so that the following expressions (1), (2), and (3) are satisfied: It is.

Furthermore, the optical fiber winding method according to the seventh aspect of the present invention is the optical fiber winding method according to any one of the fourth to sixth aspects,
The bobbin has a third collar part in addition to the first collar part and the second collar part, and the first collar part and the third collar part are both end sides in the direction along the rotation axis. And the second collar is formed between the first collar and the third collar, and the first collar and the second collar are between the first collar and the first collar. A winding portion is formed, and a second winding portion is formed between the second flange portion and the third flange portion, and the first winding portion extends along the rotation axis. The width of the direction is determined to be smaller than the width of the direction along the rotation axis of the second winding unit.

And the optical fiber winding method by the 8th aspect of this invention is the optical fiber winding method of the said 7th aspect,
As the bobbin, a bobbin having an outer diameter smaller than that of the second collar is used.

Using the optical fiber terminal fixture of the present invention, in order to start winding the optical fiber around the bobbin, not only sandwiching the terminal on the optical fiber winding start side on the outer surface side of the bobbin collar, Even in the case of a bobbin having a narrow winding portion, the optical fiber can be reliably and easily introduced into the narrow winding portion. Further, according to the winding method of the present invention, the winding operation of the optical fiber around the winding portion having a small width can be automated by performing winding using the optical fiber terminal fixture. Therefore, it is possible to save labor and improve the efficiency of the winding operation using the bobbin having the winding portion having a narrow width.
In the present invention, since the optical fiber terminal fixture has a function of a winding start auxiliary member at the start of winding (for example, a function of a laterally moving member in the conventional method), the winding start auxiliary is separately provided. It is also possible to save the space for arranging the member, and thus it can contribute to space saving around the winding machine, and it is not necessary to operate the winding auxiliary member again after fixing the winding start terminal, The time required to start winding with respect to the winding unit can also be shortened.

It is a right view which shows the optical fiber terminal fixture of one Embodiment of this invention. It is sectional drawing in the II-II line of FIG. It is a left view which shows an example of the bobbin used in combination with the optical fiber terminal fixture shown in FIG. 1, FIG. FIG. 4 is a partially cutaway front view of the bobbin shown in FIG. 3. FIG. 4 is a left side view showing, in an enlarged manner, the vicinity of the introduction groove for the first flange on the outside of the bobbin shown in FIG. 3. It is sectional drawing in the VI-VI line of FIG. It is sectional drawing in the VII-VII line of FIG. Before starting the winding of the optical fiber by combining the optical fiber terminal fixture shown in FIGS. 1 and 2 and the bobbin shown in FIGS. It is a partial notch front view which shows a step. FIG. 9 is a partially cutaway front view showing a stage where the winding start side end of the optical fiber is fixed following the stage of FIG. 8. It is sectional drawing which expands and shows the principal part of FIG. It is a schematic diagram from the left side, showing the situation where the optical fiber is introduced into the introduction groove by rotating the bobbin as (a) to (c). It is a figure which shows the schematic diagram from the upper surface side corresponding to (b) and (c) of FIG. 11 as (a) and (b). It is a schematic diagram in the same position as FIG. 10 which shows the definition of the dimension of each part of an optical fiber terminal fixture and a bobbin. It is explanatory drawing for deriving the desirable dimensional relationship of each part about the optical fiber terminal fixture of this invention, and a bobbin, 1st which shows the condition when the conventional method is implemented about the case where the side edge of an introduction groove is not chamfered It is explanatory drawing. It is the 2nd explanatory view about the situation similar to FIG. It is the 3rd explanatory view about the situation similar to FIG. It is explanatory drawing for deriving the desirable dimensional relationship of each part about the optical fiber terminal fixture of this invention, and a bobbin, 1st which shows the condition when the conventional method is implemented about the case where the side edge of an introduction groove is chamfered It is explanatory drawing. It is the 2nd explanatory view about the situation similar to FIG. It is the 3rd explanatory view about the situation similar to FIG. It is a mimetic diagram for explaining an introduction slot. It is a rough solution figure showing the dimensional relationship of each part of an optical fiber terminal fixture and bobbin in the case of winding up an optical fiber on a narrow winding part by the method of the present invention. It is a typical left view which shows an example of the conventional method for introduce | transducing the winding start terminal vicinity of an optical fiber into the bobbin drum. It is a typical front view with respect to FIG. It is a perspective view which shows the introduction groove | channel of the collar part at the time of implementing the conventional method shown by FIG. It is a rough front view which shows an example of the bobbin used for winding of an optical fiber. It is a schematic diagram which shows the condition at the time of trying to wind the winding start end vicinity of an optical fiber around the bobbin shown in FIG. 25 by the conventional method.

Hereinafter, embodiments of the present invention will be described in detail.
1 and 2 show an overall configuration of an example of the optical fiber terminal fixture according to the present invention.
1 and 2, the optical fiber terminal fixture 30 is constituted by a base (disk-shaped base) 32 having a disk shape as a whole by using a relatively hard resin such as ABS resin or a metal such as aluminum. . A shaft hole 34 through which a rotating shaft of a winder (not shown) is inserted is formed through the central portion of the disc-like base body 32 along the central axis O. Further, a protruding portion 36 that protrudes in a direction parallel to the central axis O is formed in a part of the disk-like base 32 that is close to the outer peripheral edge of the one disk surface 32A.

  The raised portion 36 is formed in a part of the circumferential direction of the disc-like base body 32, and the radial cross-sectional shape of the disc-like base body 32 in the raised portion 36 is on both sides of the top portion (location of the maximum protruding position) 36A. Is a triangular shape with inclined surfaces 36B, 36C or a similar shape. In other words, the raised portion 36 has an outer peripheral side inclined surface 36B that is inclined in the diameter-reducing direction from the outer peripheral edge of the disk-shaped base 32 toward the top 36A, and a diameter-increasing direction from the inner disk surface 32A of the disk-shaped base 32 toward the top 36A. The inclined inner peripheral side inclined surface 36C forms a triangular or similar contour of the cross section. Here, since the raised portion 36 is a portion that comes into contact with the optical fiber, it is desirable to make the surface smooth so as not to damage or catch the optical fiber. In particular, the top portion 36A of the raised portion 36 is desirably chamfered so as to be a smooth arc surface.

  Further, the inner surface 32A of the disk-shaped base 32, that is, the same surface 32A as the side from which the raised portion 36 protrudes, faces a small-diameter outer flange (first flange) 25A of the bobbin 20 described later, It is set as the clamping surface 38 for pinching | pinching and fixing a winding start terminal part of an optical fiber. Here, with respect to the disk surface 32A on the inner side of the raised portion 36 in the disk-shaped substrate 32, the material of the disk-shaped substrate 32 is appropriately selected, or a surface roughening treatment or a surface roughening process is performed, thereby providing an optical fiber. A flat surface having a coefficient of friction that does not slip the terminal, and the flat surface itself may function as the clamping surface 38, or although not shown, a sheet made of a material having a high coefficient of friction such as rubber The sandwiching surface 38 may be formed by sticking the buffer material to the inner board surface 32A. In addition, when sticking a sheet-like cushioning material to the inner board surface 32A to form the sandwiching surface 38, the sheet-like cushioning member does not necessarily need to be stuck to the entire inner board surface 32A, and is part of the inner board surface 32A. It may be attached, or may be divided into a plurality of pieces and attached to a plurality of locations on the inner board surface 32A to form a plurality of clamping surfaces 38.

  Here, the reason why the cross-sectional shape in the radial direction of the raised portion 36 in the present embodiment is a triangular shape or a similar shape (substantially triangular shape) is based on the relationship with the bobbin 20 in FIGS. 3 and 4 to be described later. Next, a description will be given.

  The inner peripheral inclined surface 36C of the raised portion 36 functions effectively so as not to bend and damage the optical fiber holding the terminal. If the portion corresponding to the inner peripheral inclined surface 36C has a staircase shape, the optical fiber is pressed against the corner of the staircase and bends rapidly, and may be rubbed and damaged by the corner of the staircase.

  On the other hand, the outer peripheral inclined surface 36B is for winding the optical fiber around the first winding part (narrow winding part) 21 without escaping the optical fiber even when the traveling path of the optical fiber is somewhat disturbed. Works effectively. If the part corresponding to the outer peripheral inclined surface 36B is a surface perpendicular to the disk surface of the disk-shaped substrate 32 (or an inclined surface opposite to FIG. 2), the optical fiber is on the outer periphery of the disk-shaped substrate 32. Or there exists a possibility that it may be wound up by the member (on the outer periphery of the optical fiber terminal fixture 30, and the winder side) on the opposite side to a bobbin.

  Further, at least a part of the raised portion 36 of the optical fiber terminal fixture 30 is inserted inside the introduction groove 28 formed on the outer peripheral edge of the first flange portion 25A outside the bobbin 20 as will be described later. It is prescribed as follows. Further, as will be described later, the clamping surface 38 of the optical fiber terminal fixture 30 needs to be in close contact with the outer surface (flat surface) of the first flange 25A outside the bobbin 20, and the raised portion 36 is Further, the clamping surface 38 is formed so as not to prevent the tight contact with the outer surface (flat surface) of the first flange portion 25A.

  Since at least a part of the raised portion 36 is inserted into the introduction groove 28 as described above, from the central axis O of the disc-shaped base 32 to the base end (rising portion) 36Ca of the inner peripheral inclined surface 36C in the raised portion 36. The distance r3 is smaller than the radius r1 (see FIG. 4) of the first flange portion 25A outside the first winding portion (narrow winding portion) 21. At the same time, the length in the circumferential direction of the disk-like base of the portion inserted into the introduction groove 28 in the raised portion 36 is determined to be smaller than the length in the circumferential direction of the introduction groove 28. Furthermore, the distance r3 is a distance from the position of the central axis O of the bobbin to the bottom of the introduction groove 28 so as not to prevent the tight contact of the clamping surface 38 with the outer surface (flat surface) of the first flange 25A. It is determined to be larger than r2 (see FIG. 4).

  Further, at the end of the optical fiber, here, at least a part of the raised portion 36 of the fixture 30 is inserted inside the introduction groove 28 of the first flange 25A of the bobbin 20, and the inner edge of the introduction groove 28 The size and shape of the raised portion 36 so that there is a continuous gap G (see FIGS. 10 to 12) between the entire edge (the edge of the bottom portion and the edge of the side edge portion) and the outer surface of the raised portion 36. Is determined according to the size and shape of the introduction groove 28. Here, the specific dimension of the gap G (the dimension of the minimum part of the gap) is not particularly limited, but the movement of the optical fiber 11 in the tilt direction is allowed in the gap, and the optical fiber 11 is moved by the movement of the optical fiber 11. It is desirable to set it to such an extent that it does not easily leave the gap. The specific dimension of the gap G may be, for example, 2 mm or more or 3 mm or more. However, in practice, the ease of entering and leaving the optical fiber 11 also varies depending on the shape and size of the raised portion 36 or the control accuracy when the raised portion 36 is inserted into the introduction groove 28. It is desirable to set the gap appropriately according to the conditions. For example, when the shape of the raised portion 36 is hemispherical or conical, it is easy to insert the raised portion 36 into the introduction groove 28, and among the gaps between the raised portion 36 and the introduction groove 28, there is a gap on the bottom side. If it becomes larger, the optical fiber 11 can easily escape, and further, a control error when inserting the raised portion 36 into the introduction groove 28 is large, and if the raised portion 36 is offset in the introduction groove 28, the optical fiber 11 is Since it becomes difficult to enter the gap, it is desirable to appropriately determine the gap according to these conditions.

  In addition, when the top part 36A of the raised part 36 is too far from the first flange part 25A outside the first winding part (narrow winding part) 21, the dimensional relationship between the parts will be described later. In addition, the inclination of the optical fiber may be insufficient for overcoming the first flange 25A. On the other hand, if the top portion 36A of the raised portion 36 comes into contact with the first flange portion 25A, the optical fiber is sandwiched between the raised portion 36 and the first flange portion 25A, and the winding cannot proceed smoothly. Since the optical fiber may be damaged or bent, the height (the height from the extended surface of the clamping surface 38) of the top portion (maximum height portion) 36A of the raised portion 36 is the first flange portion. It is desirable to set the height so as not to contact 25A. Thus, it is desirable that the dimensions of each part of the optical fiber terminal fixture 30 be appropriately determined according to the dimensions of each part of the bobbin 20, and details thereof will be described later.

3 and 4 show an example of an optical fiber winding bobbin 20 used in combination with the optical fiber terminal fixture 30 shown in FIGS.
The bobbin 20 basically has a small-diameter outer collar (first collar) 25A and a large-diameter intermediate collar (second collar) 25B, as shown in FIG. In between, a narrow winding portion (first winding portion) 21 having a small width W1 in the direction along the central axis (rotation axis) O is formed, and an intermediate flange portion (second flange portion) 25B. And a wide winding part (second winding part) 23 having a large width W2 in the direction along the rotation axis is formed between the outer diameter flange part (third collar part) 25C and the large-diameter outer collar part. Yes. Further, similarly to a general bobbin, a shaft hole 27 through which a rotating shaft (winding shaft) of the winder is inserted is formed. And in the bobbin 20 of this example, the large diameter flanges (the second flange part 25B and the third flange part 25C) on both sides of the wide winding part (second winding part) 23 from the outer peripheral side. Cut slits 22 are formed. Further, a plurality of reinforcing ribs 29 are provided on the outer surface side of the large-diameter collars (second collar part 25B and third collar part 25C) on both sides of the wide winding part (second winding part) 23. Is provided. These ribs 27 are not essential, but are often provided in order to compensate for the strength reduction accompanying the reduction in the thickness and weight of the collar.

  Furthermore, an introduction groove 28 cut inward in the radial direction from the outer peripheral surface 25Aa is formed at a predetermined position of the first flange portion 25A outside the narrow first winding portion 21 in the bobbin 20. ing. Details of the introduction groove 28 are shown in FIGS. 5 is an enlarged view of the vicinity of the introduction groove 28 on the left side as in FIG. 3, FIG. 6 is a cross section taken along line VI-VI in FIG. 5, and FIG. 7 is a cross section taken along line VII-VII in FIG. ing.

As shown in FIG. 5, in the introduction groove 28, boundary regions 28D and 28E between the side edge portions 28A and 28B and the bottom edge portion 28C on both sides viewed from the direction along the rotation axis of the bobbin 20 are smoothly curved. In addition, boundary regions 28F and 28G between the outer peripheral edge surface 25Aa of the circumferential surface shape of the outer flange portion 25A and the side edge portions 28A and 28B of the introduction groove 28 also form a smooth curved shape in the same manner. Yes.
Also, as shown in FIGS. 6 and 7, from the outer peripheral surface 25Aa of the outer flange 25A, from the boundary region 28F in the introduction groove 28, the side edge 28A, the boundary region 28D, the bottom edge 28A, and the boundary region 28D. A portion returning to the outer peripheral edge surface 25Aa of the outer flange portion 25A through the side edge portion 28B and the boundary region 28G is chamfered with a radius of curvature R as seen in a cross section along the thickness direction. In addition, it is desirable that a portion other than the introduction groove 28 in the outer peripheral edge 25Aa of the outer flange portion 25A is chamfered at a corner portion of the cross section in the thickness direction.

  A method of winding the optical fiber 11 around the bobbin 20 shown in FIGS. 3 to 7 using the optical fiber terminal fixture 30 shown in FIGS. An example of a method for fixing the terminal and winding the optical fiber around the first winding portion (narrow winding portion) 21 of the bobbin 20 will be described with reference to FIGS. In the following description, the optical fiber terminal fixture 30 may be simply referred to as a fixture 30.

First, as shown in FIG. 8, the optical fiber terminal fixture 30 is mounted on the rotating shaft (winding shaft) 7 of the winder so as to rotate integrally with the rotating shaft 7. Further, the rotary shaft (winding shaft) of the winder is arranged so that the outer surface of the first flange portion 25A on the outside of the bobbin 20 faces the disk surface (clamping surface 38) of the disk-shaped base 32 in the fixture 30. ) Attach to 7. At this time, regarding the positional relationship between the optical fiber terminal fixture 30 and the bobbin 20, in this example, the raised portion 36 of the fixture 30 corresponds to the position of the introduction groove 28 of the first flange portion 25A of the bobbin 20. Set to do.
Before or after the bobbin 20 is mounted, the end portion of the optical fiber 11 to be wound is set so as to be positioned between the clamping surface 38 of the fixture 30 and the first flange 25A of the bobbin 20 (hanging down). ) At this time, in this example, the optical fiber 11 is positioned so that a part of the optical fiber 11 is located between the raised portion 36 of the fixture 30 and the introduction groove 28 of the first flange portion 25A of the bobbin 20. Keep it (hang it down).

  Next, as shown in FIG. 9, the first collar 25 </ b> A of the bobbin 20 is moved to a position where it contacts the clamping surface 38 of the fixture 30, and the outer surface of the first collar 25 </ b> A becomes the clamping surface 38. The terminal portion of the optical fiber 11 to be pressed and wound is sandwiched between the clamping surface 38 of the fixture 30 and the first flange 25A of the bobbin 20, and fixed and held. The force for pressing the bobbin 20 against the holding surface 38 of the fixing tool 30 is such that the optical fiber 11 does not slip even when the winding tension is applied, so that the holding surface 38 of the fixing tool 30 and the first flange 25A of the bobbin 20 are not slipped. It is desirable to appropriately determine the coefficient of static friction between the flat surface and the optical fiber 11 and the length of the optical fiber 11 sandwiched therebetween.

As described above, the end portion of the optical fiber 11 is sandwiched between the clamping surface 38 of the fixture 30 and the first flange 25A outside the bobbin 20, and at the same time, a part of the raised portion 36 of the fixture 30 is It is inserted into the introduction groove 28 (in the gap G) of the first flange 25A. Accordingly, as shown in FIGS. 9 and 10, the optical fiber 11 is pushed into the introduction groove 28 and further pushed toward the second collar part (intermediate collar part) 25 </ b> B of the bobbin 20.
That is, since r2 <r3 <r1 is satisfied, the base end (rising portion) 36Ca of the raised portion 36 is on the outer peripheral side with respect to the bottom of the introduction groove 28 of the first flange portion 25A and the first flange portion. Further, the raised portion 36 is protruded (raised) toward the second flange portion (intermediate flange portion) 25B, and therefore the optical fiber 11 is introduced into the introduction groove by the raised portion 36. 28 is pushed toward the second flange 25B through 28.

  Subsequently, when the bobbin 20 is rotated in the winding direction, the optical fiber 11 gets over the first flange portion 25A outside the bobbin 20 and is introduced into the first winding portion (narrow winding portion) 21. The

  Here, in the above example, one end of the optical fiber 11 is in a stage before the end portion of the optical fiber 11 is clamped between the clamping surface 38 of the fixture 30 and the outer surface of the first flange portion 25A of the bobbin 20. The optical fiber 11 is positioned (hangs down) so that the portion is located between the raised portion 36 of the fixture 30 and the introduction groove 28 of the first flange portion 25A of the bobbin 20. That is, the position of the optical fiber 11 is adjusted in advance to the positions of the raised portion 36 and the introduction groove 28.

  However, the position of the optical fiber 11 is not necessarily matched with the positions of the raised portion 36 and the introduction groove 28. That is, even if the optical fiber 11 hung between the clamping surface 38 of the fixture 30 and the outer surface of the first flange 25A of the bobbin 20 is disengaged from the positions of the raised portion 36 and the introduction groove 28, the bobbin 20 Is rotated in the winding direction, the optical fiber 11 can be passed over the first flange 25A and smoothly introduced into the first winding portion (narrow winding portion) 21. An example in that case will be described with reference to (a), (b), (c) of FIG. 11 and (a), (b) of FIG.

  11A, 11 </ b> B, and 11 </ b> C, the positions of the introduction groove 28 formed in the first flange portion 25 </ b> A outside the bobbin 20 and the raised portion 36 of the fixture 30 are shown in the optical fiber 11. The situation when the bobbin 20 is rotated in the winding direction will be shown step by step with respect to the case where it has deviated from the position. 12 (a) is a schematic plan view from the position of XIIa in FIG. 11 (b), and FIG. 12 (b) is a schematic view from the position of XIIb in FIG. 11 (c). It is a top view.

If the bobbin 20 is rotated in the winding direction from the state shown in (a) of FIG. 11 (the direction of rotation is indicated by an arrow), a part of the optical fiber 11 is positioned at the introduction groove 28 and the raised portion 36. As shown in FIG. 11B and FIG. 12A, a part of the optical fiber 11 is pushed inward (the second flange 25B side) by the raised portion 36 when the optical fiber 11 reaches In addition, a part of the optical fiber 11 falls into the gap G between the inner edge of the introduction groove 28 and the outer surface of the raised portion 36. In other words, as the bobbin 20 and the fixture 30 rotate, a part of the optical fiber 11 is pushed toward the second flange 25B by the raised portion 36, and a part of the optical fiber 11 is introduced into the introduction groove 28. It gets caught in the gap G inside. If the bobbin 20 is further rotated, the optical fiber 11 passes through the gap G in the introduction groove 28 as shown in FIG. 11C and FIG. Is introduced into the inside of the first flange portion 25A, that is, the first winding portion (narrow winding portion) 21.
Therefore, regardless of the relationship between the position of the optical fiber 11 and the positions of the introduction groove 28 and the raised portion 36 when the winding start side terminal portion of the optical fiber 11 is clamped / fixed, a part of the optical fiber 11 is moved to the first portion. It can be easily introduced into the first winding portion (narrow winding portion) 21 inside the flange portion 25A.

Next, a desirable dimensional relationship between each part of the optical fiber terminal fixture 30 and the bobbin 20 will be described with reference to FIGS.
The code | symbol showing the dimension of each part is as follows, as shown in FIG.
A: The width (= W1) of the first winding portion (narrow winding portion) 21.
B: The thickness of the first flange portion 25 </ b> A outside the first winding portion (narrow winding portion) 21.
C ₁ : height of the first flange portion 25A outside the first winding portion (narrow winding portion) 21.
C ₂ : depth of the introduction groove 28 formed in the first flange portion 25A.
R: radius of curvature of the chamfered portion when the side edge of the introduction groove 28 is chamfered (R = 0 when not chamfered).
D: Height of the raised portion 36 of the fixture 30 (height from the extended surface of the clamping surface 38 to the top portion 36A of the raised portion 36).
E: Distance from the outer peripheral edge of the first flange portion 25A outside the first winding portion 21 to the top portion 36A of the raised portion 36 in the radial direction of the bobbin 20 and the fixture 20.
L: The distance between the first flange 25A and the second flange (intermediate flange) 25B in the direction parallel to the rotation axis of the bobbin 20 (the rib 29 is formed outside the second flange 25B). If it is, the distance between the inner surface of the first flange 25A and the outermost surface of the second flange 25B including the rib 29 as shown in FIG.
H: Height of the second collar part (intermediate collar part) 25B from the outer peripheral surface of the second winding part (wide winding part) 23.

In FIG. 13, the depth _{C 2} of the introducing groove 28, although those first smaller than the height _{C 1} of the flange portion 25A, the depth _{C 2} of the guide grooves 28 of the first flange portion 25A it is the same as the height C ₁ may be. That is, C ₁ = C ₂ may be used.

  If the dimensions of the respective parts are defined as described above, first, a fixture that does not have the raised portion 36 (therefore, a flat disc-like fixture similar to the conventional one; a fixture that is substantially only the clamping surface 38) was used. Assume that Even in this case, the relational expression of the bobbin dimensions that can guide the optical fiber to the winding portion after the end portion of the optical fiber is sandwiched can be expressed by the following equation (4). Here, it is assumed that the introduction groove 28 of the first flange portion 25A is not chamfered at the edge (that is, the radius of curvature R = 0 of the chamfer).

Next, the expression (4) will be described with reference to FIGS. In FIG. 14 to FIG. 16, the rib 29 of the first flange 25 </ b> A is omitted for simplification of description. The same applies to FIGS. 17 to 19 and FIG. 21, which will be cited later.
As schematically shown in FIG. 14, the left side of the expression (4) indicates that the optical fiber 11 held by the holding surface 38 is positioned on the holding surface 38 side at the bottom of the introduction groove 28 (an edge that is not chamfered). ) To the position of the outer peripheral edge of the first flange portion 25A (the edge on the second flange portion 25B side) and the inclination when the optical fiber 11 is stretched. On the other hand, as schematically shown in FIG. 15, the right side of the expression (4) passes through the bottom of the introduction groove 28 from the sandwiching surface 38 and the corner (first first edge) of the second flange 25B. The inclination when the optical fiber 11 is stretched at the corner of the flange portion 25A is shown.
If the left side of the above expression (4) is larger than the right side, the optical fiber 11 is brought into contact with the corner of the second flange 25B by a laterally moving member (for example, reference numeral 15 in FIGS. 22 and 23) as in the conventional example. If pushed to the bobbin 20 side, the optical fiber 11 is guided to the winding portion 21 by being caught across the introduction groove 28. The positional relationship between the bobbin 20 and the optical fiber 11 at that time is as shown in FIG. 16 when the introduction groove 28 is viewed from directly above.

  When the side edge of the introduction groove 28 is chamfered with a radius of curvature R (or chamfered with a distance R from the edge to the chamfer start point), the above equation (4) is transformed into the following equation (5). .

  FIG. 17 shows the situation on the left side and the situation on the right side in the above equation (5) when the side edge of the introduction groove 28 is chamfered with the curvature radius R. FIG. When the side edge of the introduction groove 20 is chamfered as shown in FIGS. 17 to 19, if the optical fiber 11 is pressed against the chamfered portion of the introduction groove 28, the optical fiber 11 slides along the chamfered curved surface, It is considered to be guided to the winding unit 21. The positional relationship between the bobbin 20 and the optical fiber 11 at this time is as shown in FIG. 19 when the introduction groove 28 is viewed from directly above.

  As described above, the optical fiber terminal fixture 30 of the present invention can be wound when the fixture having no characteristic raised portion 36 is used and winding is performed according to the conventional method using the laterally moving member. Although the conditions are shown, if the fixing device of the present invention having the raised portion 36 is used, the above condition is not satisfied, that is, the automatic winding is difficult even if the laterally moving member is used. However, it is possible to perform winding. This means that the present invention exerts an effect when the above expression (4) or (5) is not satisfied. Accordingly, the relational expression of the optimum bobbin size when applying the present invention is expressed as the following expression (6) (same as the expression (1) already shown). If the side edge of the introduction groove 28 is not chamfered, R = 0 in the equation (6).

  Here, when the introduction groove 28 is used for the purpose of guiding the optical fiber 11, it is required that the introduction groove 28 satisfies the condition that the optical fiber 11 is caught. As shown in FIG. 20, the condition is that the tangential track P of the optical fiber 11 in a state of being caught in the guide groove 28 is located on the outer peripheral side (that is, on the arrow Q side with respect to the tangential track P). It is that the collar part outer peripheral surface part S of the edge part protrudes. If the introduction groove 28 has such a shape that satisfies such conditions, the optical fiber 11 can be hooked on the introduction groove 28.

Refer to FIG. 21 for the optimum dimensional relationship between the fixing tool 30 and each part of the bobbin 20 in the case of winding using the fixing tool 30 having the raised portion 36 using the introduction groove 28 that satisfies the above conditions. And will be described below.
First, the conditions under which the optical fiber 11 is introduced into the winding section 21 across the introduction groove 28 are expressed by the following formula (7) (same as the formula (2) already shown).

  As shown in FIG. 21, the left side of the expression (7) indicates the inclination of the optical fiber 11 stretched so as to come into contact with the top 36A of the raised portion 36 of the fixture 30 from the clamping surface 38 through the bottom of the introduction groove 28. Show. Further, as shown in FIGS. 15 and 18, the right side of the expression (7) is chamfered on the outer peripheral edge of the second collar part (intermediate collar part) 25 </ b> B from the clamping surface 38 through the bottom of the introduction groove 28. The inclination of the optical fiber 11 stretched so as to be in contact with the starting boundary (the first winding part 21 side) is shown. The fact that the left side in the equation (7) is smaller than the right side means that the optical fiber 11 is pushed into the second flange 25B side by the tip of the raised portion 36 (the top portion 36A) of the fixture 30. This means that it is guided to the first winding part (narrow winding part) 21 through the introduction groove 28 over the outer first flange part 25A.

  However, if the tip (top portion 36A) of the raised portion 36 of the fixture 30 completely exceeds the region of the first winding portion (narrow winding portion) 21, the raised portion 36 is formed on the second flange portion 25B. Therefore, it is desirable that the following expression (8) (same as (3) already shown) is satisfied.

  Based on the above equation (8), the above equation (7) can also be expressed by the following equation (9).

  In addition, since E in Formula (9) is small (the apex portion 36A of the raised portion 36 and the outer peripheral edge of the first flange portion 35A are closer), the optical fiber 11 is bent smaller, so the lower limit of E is the optical fiber. 11 allowable bending diameters.

  As described above, the conditions defined by the expressions (6), (7), and (8), in other words, the conditions defined by the expressions (1), (2), and (3) If the optical fiber is wound up by combining the bobbin 20 and the optical fiber terminal fixture 30 that meet the requirements, the terminal can hold the clamping surface of the fixture and the flange on the outside of the bobbin even for a narrow winding portion. The optical fiber that is sandwiched and fixed with the (first flange) can be reliably and easily introduced into the narrow winding portion. In other words, the optical fiber with the terminal fixed can be automatically introduced into a narrow winding section with the rotation of the bobbin at the start of winding. Therefore, if a program is appropriately set up, it is possible to automate the process of fixing the optical fiber winding start terminal and winding it onto the bobbin.

Further, in the case of the present invention, since the portion for guiding the optical fiber (the raised portion 36) is integrated with the optical fiber terminal fixture 30 attached to the winder, the area occupied by the device is particularly increased. The winding method of the present invention can be carried out with the minimum necessary space.
Furthermore, the preparation for introducing the optical fiber into the take-up portion is completed simply by sandwiching and fixing the winding start terminal of the optical fiber between the fixture 30 and the bobbin collar side surface. Therefore, since it is not necessary to move the device for guiding the optical fiber again after fixing the winding start terminal, the time required to start winding does not increase.

  When the optical fiber 11 is continuously wound around the second winding portion 23 after the optical fiber 11 is wound around the narrow first winding portion 21 as described above, for example, the second The optical fiber 11 may be guided from the first winding portion 21 to the second winding portion 23 through the slit 22 (see FIG. 3) formed in the flange portion 25B. The transition from winding to winding of the second winding unit 23 can be easily automated.

Using two types of bobbins A, B, and one type of optical fiber terminal fixture that satisfy the above-described conditions, optical fiber fixation (the clamping surface 38 of the fixture 30 and the first flange 35A of the bobbin 20) ) And a winding experiment were performed.
Table 1 below shows the dimensions of each part of the two types of bobbins A, B, and one type of optical fiber terminal fixture that were tested. Further, Table 2 shows the results of verifying that each of these dimensions satisfies the expressions (1), (2), and (3).

  Each bobbin A, B is combined with an optical fiber terminal fixture, and the end of the optical fiber winding side is clamped between the clamping surface 38 of the fixture and the outer surface of the first flange 25A of the bobbin. An experiment was conducted in which the optical fiber was guided from the introduction groove 28 to the first winding part (narrow winding part) 21 and then wound up for a certain length by rotating the bobbin after fixing. The optical fiber could be smoothly wound around the first winding portion (narrow winding portion) 21.

  In each of the above-described embodiments, the bobbin 20 having the narrow first winding part (narrow winding part) 21 and the wide second winding part (wide winding part) 23 is used. The case where the optical fiber 11 is wound around the first winding portion (narrow winding portion) 21 having a narrow width has been described. However, even when the optical fiber 11 is wound only on a bobbin having only a narrow winding portion. Of course, the optical fiber terminal fixture of the present invention and the winding method of the present invention can be applied.

  The preferred embodiments and experimental examples of the present invention have been described above, but the present invention is not limited to these embodiments and experimental examples. Additions, omissions, substitutions, and other modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 11 ... Optical fiber, 20 ... Bobbin, 21 ... 1st winding part (narrow winding part), 23 ... 2nd winding part (wide winding part), 25A. .. 1st collar part, 25B ... 2nd collar part (intermediate collar part), 25C ... 3rd collar part, 28 ... introduction groove, 30 ... optical fiber terminal fixture, 32 ... disk-shaped substrate, 36 ... raised portion, 36A ... top, 38 ... clamping surface.

Claims (8)

A terminal portion on the winding start side of the optical fiber to be wound is sandwiched between the outer periphery of the optical fiber winding bobbin and attached to the rotary shaft of the winder, and the terminal portion is An optical fiber terminal fixing tool for winding an optical fiber for fixing, and a combination with an optical fiber winding bobbin in which a fiber introduction groove is formed in a part of the outer peripheral edge of the first flange In an optical fiber terminal fixture for use in
It consists of a base that forms a disc shape as a whole,
And the disk surface of the disk-shaped substrate has a clamping surface that sandwiches the end portion of the optical fiber with the first flange of the bobbin,
Further, a part of the outer peripheral side of the disk surface on the bobbin side of the disk-shaped substrate is formed with a raised portion that protrudes toward the bobbin and at least a part is inserted into the fiber introduction groove. An optical fiber terminal fixture for winding an optical fiber.   The distance from the central axis position of the disc-shaped substrate to the rising proximal end of the raised portion on the side of the central axis position is smaller than the radius of the first flange portion of the bobbin, and the fiber is introduced from the central axis position of the bobbin. The length of the portion of the raised portion that is inserted into the introduction groove in the circumferential direction of the disk-shaped base is greater than the distance to the bottom of the groove. The optical fiber terminal fixture for winding an optical fiber according to claim 1, wherein the optical fiber terminal fixture is set smaller than the length of the optical fiber.   3. The optical fiber take-up device according to claim 1, wherein a cross-sectional shape of the raised portion in a radial direction of the disk-shaped substrate is a substantially triangular shape. Optical fiber terminal fixture. The optical fiber terminal fixture according to any one of claims 1 to 3, and the first flange and the second flange adjacent to the first flange. A bobbin in which a winding portion of 1 is defined and a fiber introduction groove is formed in a part of the outer peripheral edge of the first flange portion,
The end portion on the winding start side of the optical fiber is fixed by being sandwiched between the holding surface of the optical fiber terminal fixture and the first flange of the bobbin, and a part of the optical fiber is fixed to the raised portion The optical fiber terminal fixture and the bobbin are then rotated together by pushing them toward the bobbin side, and a part of the optical fiber is separated from the outer surface of the raised portion of the optical fiber terminal fixture and the first flange portion. The optical fiber is introduced into the first winding portion inside the first flange through the gap between the inner edge surface of the optical fiber introduction groove and the optical fiber is wound around the first winding portion. An optical fiber winding method. The optical fiber terminal fixture according to any one of claims 1 to 3, and the first flange and the second flange adjacent to the first flange. A bobbin in which a winding portion of 1 is defined and a fiber introduction groove is formed in a part of the outer peripheral edge of the first flange portion,
A terminal portion on the winding start side of the optical fiber is fixed by being sandwiched between the holding surface of the optical fiber terminal fixture and the first flange of the bobbin, and the optical fiber terminal fixture and the bobbin are integrated. By rotating and dropping a part of the optical fiber into the gap between the outer surface of the raised portion of the optical fiber terminal fixture and the inner edge surface of the optical fiber introduction groove of the first flange portion, An optical fiber winding method, wherein the optical fiber is wound around the first winding portion by being introduced into the first winding portion inside the first flange portion. The dimensions of each part of the bobbin and the optical fiber terminal fixture,
A: width of the first winding part of the bobbin,
B: the thickness of the first flange of the bobbin,
C ₁ : the height of the first buttocks of the bobbin,
C ₂ : depth of the introduction groove of the first flange of the bobbin,
R: radius of curvature of the chamfered portion when the side edge of the introduction groove is chamfered (however, including R = 0),
D: Height from the extended surface of the clamping surface to the top of the raised portion in the optical fiber terminal fixture,
E: distance from the outer peripheral edge of the first flange of the bobbin to the top of the raised portion of the optical fiber terminal fixture in the radial direction of the bobbin and the optical fiber terminal fixture;
L: an interval between the first flange and the second flange in a direction parallel to the rotation axis of the bobbin,
The dimensions of each part of the bobbin and the optical fiber terminal fixture are determined so that the following expressions (1), (2), and (3) are satisfied: The optical fiber winding method according to claim 4 or 5.

  The bobbin has a third collar part in addition to the first collar part and the second collar part, and the first collar part and the third collar part are both end sides in the direction along the rotation axis. And the second collar is formed between the first collar and the third collar, and the first collar and the second collar are between the first collar and the first collar. A winding portion is formed, and a second winding portion is formed between the second flange portion and the third flange portion, and the first winding portion extends along the rotation axis. The width in the direction is determined to be smaller than the width in the direction along the rotation axis of the second winding unit. Optical fiber winding method.   The optical fiber winding method according to claim 7, wherein the bobbin has an outer diameter smaller than that of the second flange portion.

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