JP2514517B2 - Optical fiber coil - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber coil used as a sensor coil of an optical fiber gyro, for example.

[0002]

2. Description of the Related Art A conventional optical fiber coil of this type is shown in FIG.
As shown in FIG. 3, an optical fiber 13 is wound around a cylindrical bobbin 12 having a brim 11 at each end, and the optical fiber gyro is used as a sensor coil for high-precision and stable detection. 13 and between the optical fiber 13 and the bobbin 12 are adhered with an adhesive to prevent the optical fiber 13 from being loosened or displaced.

Bonding between the optical fibers 13 and between the optical fibers 13 and the bobbin 12 has been performed by applying an adhesive to the optical fibers 13 and winding the adhesive around the bobbins 12.

[0004]

As described above, the conventional optical fiber coil has a structure in which the optical fiber is adhered and fixed by winding it around the bobbin while applying the adhesive to the optical fiber. However, the assembly requires complicated application of adhesive and winding at the same time, which is poor in workability and requires a lot of man-hours.

If, for example, the work is interrupted during the work of winding the optical fiber around the bobbin, the adhesive on the surface of the optical fiber located at the outermost layer at that time is hardened, and the surface is uneven and the surface becomes uneven. When the winding operation is resumed next time, the irregularities may cause irregularities in the winding of the optical fiber, which causes performance degradation. Therefore,
The work of winding the optical fiber around the bobbin requires attention so as not to be interrupted on the way.

The present invention eliminates the drawbacks of the prior art and provides an optical fiber coil having a structure in which the optical fiber can be wound around the bobbin and adhered and fixed easily and with good workability, and the winding of the optical fiber is not disturbed. To do.

[0007]

SUMMARY OF THE INVENTION According to the present invention, in an optical fiber coil in which an optical fiber is wound around a tubular bobbin having a collar, holes are formed substantially uniformly in the tubular portion of the bobbin and the collar. The optical fibers of the coil, and the optical fiber and the bobbin are bonded with an adhesive.

[0008]

According to the present invention constructed as described above, the adhesive between the optical fibers of the optical fiber coil and between the optical fiber and the bobbin is applied to the outer peripheral surface of the optical fiber after the winding of the optical fiber around the bobbin is completed. This is done by applying and sucking the adhesive through the holes formed in the tubular portion and the collar of the bobbin.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows the appearance of an optical fiber coil according to the present invention, in which an optical fiber 13 is wound around a cylindrical bobbin 22 having a collar 21 at each end. Bobbin 2
As shown in detail in FIG. 2, the cylindrical portion 23 and the brim 21 of FIG. In this embodiment, small circular holes 24 of substantially the same size are formed in the cylindrical portion 23, and both flanges 21 have the same size at a substantially uniform angle in a radial pattern centered on the axis of the cylindrical portion 23. The elliptical holes 25 are formed.

Next, the optical fiber 13 of the optical fiber coil
The bonding between the optical fiber 13 and the bobbin 22 will be described. First, the optical fiber 13 is aligned with the bobbin 22 and wound a predetermined number of times. An adhesive is applied to the outer peripheral surface of the optical fiber 13 on which the winding operation is completed. Then, as shown in FIG. 3, this adhesive is applied from the inner side surface 23a of the tubular portion 23 and the outer side surface 21a of the collar 21 through the circular holes 24 and the elliptical holes 25 formed therein, respectively, in the direction indicated by the arrow 26. Vacuum suction to. Due to this suction, the adhesive applied to the outer peripheral surface of the optical fiber 13 is permeated between the wound optical fibers 13 and further between the optical fiber 13 and the bobbin 22. The suction is stopped when the adhesive is sufficiently permeated, and the adhesive is cured to bond the optical fibers 13, and the optical fiber 13 and the bobbin 22.

FIG. 4 shows another embodiment of the bobbin 22 used in the optical fiber coil according to the present invention. In this embodiment, the cylindrical portion 23 of the bobbin 22 does not have the circular hole 24 but the cylindrical hole 23. An elliptical hole 27 of the same size is formed in the circumference substantially parallel to the axial direction and over substantially the entire length in the axial direction. The holes formed in the bobbin 22 are not limited to the examples described above, and other shapes or arrangements may be used as long as they are formed substantially uniformly in the tubular portion 23 and the collar 21.

[0012]

As described above, according to the present invention, holes are formed substantially evenly in the tubular portion and the collar of the bobbin, and the optical fiber is wound around the bobbin and then the adhesive applied to the outer peripheral surface of the bobbin is used. By sucking through the holes, the adhesive that has permeated between the optical fibers and between the optical fibers and the bobbin is collectively bonded at once, and the optical fiber winding work and the adhesive fixing work are separated. Therefore, the assembling work is simple, and the workability is good and the assembling work can be performed with a small number of steps.

Further, even if the operation of winding the optical fiber around the bobbin is interrupted and restarted, the winding operation can be continued without causing winding disorder. Even if winding disorder occurs, the optical fiber is not adhered, so that it can be easily rewound.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of an optical fiber coil according to the present invention.

FIG. 2 is a perspective view showing a bobbin used in an embodiment of the optical fiber coil according to the present invention.

FIG. 3 is a sectional view for explaining bonding in one embodiment of the optical fiber coil according to the present invention.

FIG. 4 is a perspective view showing another embodiment of the bobbin used in the optical fiber coil according to the present invention.

FIG. 5 is a perspective view showing a conventional optical fiber coil.

[Explanation of symbols]

 13 optical fiber 21 collar 22 bobbin 23 tubular portion 24 circular hole 25 oval hole

Claims (1)

(57) [Claims] 1. An optical fiber coil having an optical fiber wound around a tubular bobbin having a collar, wherein holes are formed substantially uniformly in the tubular portion of the bobbin and the collar, respectively. , An optical fiber coil in which the optical fiber and the bobbin are bonded together with an adhesive.