JPH04133205U - optical fiber drum - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent performance deterioration by winding optical fibers around an optical fiber drum, which is the main component of an optical fiber gyro, and elastically and securely fixing it. [Structure] The optical fiber drum has a collar 2 at both ends of a drum body 1, and an optical fiber 3 is wound around the drum groove many times in a multilayered manner. Elastic adhesive tape 4 is adhered to its outer periphery at a plurality of locations, thereby gently and elastically fixing the optical fiber. The adhesive tape 4 consists of an open-cell sponge rubber layer made of a foamed synthetic rubber mixture and an adhesive layer coated on one side of the sponge rubber layer.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea involves wrapping an optical fiber around a drum such as an optical fiber gyro, and making it elastic. Concerning an optical fiber drum fixed with tape.

0002

[Conventional technology]

The optical fiber gyro has an optical fiber in its main component, the optical fiber drum. A fiber is wound many times, and the clockwise and counterclockwise directions of the light incident on each other from both ends of the fiber are The rotational angular velocity is detected by detecting the phase difference. Optical fiber has a core and a cladding. A single continuous optical fiber of approximately 250 μm in diameter is used. , is fed out from the optical fiber drum and connected to the phase modulator, and the other end is connected to the drum. It is drawn inside and connected to an optical fiber polarizer or the like.

0003

[Problem that the idea aims to solve]

By the way, the optical fiber wrapped around the optical fiber drum mentioned above does not have the necessary functions. In order to obtain Fixed. However, with the method of fixing with adhesive, it takes time to cure and heat is generated. The drum and adhesive expand and contract when the adhesive is applied, so they are susceptible to this. Therefore, a method to securely and loosely fix the optical fiber using tape has been considered. Ru.

0004 When fixing with this tape, use regular cellophane tape, vinyl chloride tape, paper tape, etc. Tape, which is a film coated with adhesive, is suitable for bonding flat objects. Although it is effective, many thin optical fibers are lined up and the surface becomes a surface with fine irregularities. If the tape is in contact with the protruding area only slightly, Fixed and has low adhesive strength.

[0005] In addition, the optical fiber wrapped around the drum is pulled into the drum when its end is pulled inside. It is pulled over the edges of the brim at both ends. However, the hard edge of the brim If the optical fiber is directly applied, the fiber sheath will break and loss will occur due to bending of the optical fiber. If the optical fiber is Preferably, it is fixed on a resilient member.

[0006] This idea is based on the conventional optical fiber used in the optical fiber gyro mentioned above. In consideration of various problems associated with drums, the material is wrapped around the drum many times in multiple layers. Optical fibers are elastically, loosely and securely fixed using elastic adhesive tape. Provide a fiber drum and attach the optical fiber ends to the drum using the same adhesive tape. to provide a fixed fiber optic drum that does not come into direct contact with the brim of the Take it as a challenge.

[0007]

[Means to solve the problem]

In order to solve the first problem, this invention has a structure that connects both ends of the annular drum body. Optical fibers are wound many times in multiple layers around a drum with elastic fibers wrapped around the drum. An optical fiber driver made by fixing optical fibers by gluing small pieces of adhesive tape in multiple places. The structure of the system was designed as follows.

[0008] In addition, in order to solve the second problem, in the configuration of the first solution, the The optical fiber wrapped around the ram is pulled inward and passed through the edge of the drum's collar. Fix the optical fiber by gluing small pieces of the elastic adhesive tape at multiple locations where the It is possible to have an optical fiber configuration consisting of:

[0009] In addition, in any of the above solutions, the elastic adhesive tape is used as a base material. Made of open-cell sponge-like rubber coated with adhesive on one side. It is good to say.

0010

[Effect]

Since this invention is constructed as described above, the optical fiber is elastic with respect to the drum groove. It is fixed loosely and firmly. Elastic adhesive tape fills gaps between uneven surfaces of optical fibers. This is because it fits into the gap and presses it down elastically. In this case, for example, EPDM (ethylene propylene dimethyl) sponge or urethane When sponge sponge is used as a base material for adhesive tape, it has the most ideal elasticity. can get. In the second solution, the optical fiber can be driven by using the above adhesive tape. The end can be pulled inward without contact with the edge of the collar of the arm without abrasion or cutting. can be incorporated.

[0011]

【Example】

Examples of this invention will be described below with reference to the drawings. Figure 1 is a plan view of the optical fiber drum of this invention, and Figure 2 is a view taken from line II-II in Figure 1. A cross-sectional view is shown. As shown in the figure, this optical fiber drum has two ends of the drum body 1. It has a collar 2, and an optical fiber 3 is wound around the drum groove many times in a multilayered manner. Ru. The outer periphery of the optical fiber 3 wound almost completely inside the drum groove has multiple locations (see Figure In the example shown, small pieces of elastic adhesive tape 4 are adhered to The bar 3 is fixed to the drum. The elastic adhesive tape 4 is made of a synthetic rubber compound foam whose cross section is shown in FIG. It consists of an open-cell sponge rubber layer 41 and an adhesive layer 42 coated on one side of the sponge rubber layer 41. A separator X is covered before adhesion.

0012 The foam for the sponge rubber layer 41 is, for example, EPDM sponge (ethylene plastic). (propylene dimethyl sponge) or urethane sponge are used. An optical fiber in which an optical fiber 3 is fixed to a drum using such an adhesive tape 4 The optical fiber 3 is elastically, loosely and reliably fixed to the drum. spon When pressing the optical fiber 3 with a di-rubber layer, the adhesive surface becomes dented due to the repulsion of the sponge. It also stretches and makes contact with the pressed areas, so the entire area is sticky, and even if you release the pressure, the protruding parts will remain sticky. The sponge shrinks and the whole thing stays sticky.

[0013] The optical fiber drum with the optical fibers fixed in this way is heated and expands. Even if it is stretched or contracted, the optical fiber 3 is loosely fixed, so It is not affected by performance deterioration due to drum expansion or contraction. Next, the optical fiber 3 wound around the drum as described above is as shown in FIG. Its end is pulled inside the drum. In this case, the optical fiber 3 is connected to the drum collar 2. Adhesive tapes 4a and 4b made of the same material as the adhesive tape 4 are attached to the brim near the contact area. The edge part is glued onto the end face of the drum. The optical fiber 3 is attached to the adhesive tape 4a. It runs on the sponge rubber layer and is fixed along the end surface of the drum with adhesive tape 4b. It is drawn inside the rear drum.

[0014] By using such adhesive tapes 4a and 4b, the optical fiber 3 can be Is it leaded and fixed to the body without directly touching the edge of the brim? This ensures that the optical fiber is not worn out or cut by the edge of the collar, and is stable and secure. It can actually be fixed.

[0015]

【effect】

As explained in detail above, this idea involves applying multiple layers to the optical fiber drum. Did you use elastic adhesive tape to secure the wrapped optical fiber at multiple points? Therefore, the optical fiber should be fixed gently, elastically, and securely, without the use of adhesives. This greatly improves workability and ensures stable performance.

[0016] Also, use the same elastic adhesive tape when pulling the optical fiber inside the drum. This has the advantage that contact wear and breakage of the optical fiber can be prevented. It will be done.

[Brief explanation of drawings]

[Fig. 1] Plan view of an optical fiber drum of an example.

[Figure 2] Cross-sectional view taken from line II-II in Figure 1

[Figure 3] Cross-sectional view of adhesive tape

[Fig. 4] Partially enlarged perspective view of the optical fiber drum in Fig. 1.

[Explanation of symbols]

1 Drum body 2 brim 3 Optical fiber 4 Elastic adhesive tape

Claims (3)

[Scope of utility model registration request] Claim 1: An optical fiber is wound in a multilayered manner many times around a drum having ribs at both ends of an annular drum body,
An optical fiber drum is made by fixing optical fibers by gluing small pieces of elastic adhesive tape in multiple places around the drum. 2. A method of fixing the optical fiber by adhering small pieces of the elastic adhesive tape at a plurality of locations at positions where the optical fiber wound around the drum is drawn inward and passes through the edge portion of the brim of the drum. Item 1. The optical fiber drum according to item 1. 3. The optical fiber drum according to claim 1, wherein the elastic adhesive tape is made of open-celled sponge-like rubber as a base material, and one side of the tape is coated with an adhesive.