WO2014168187A1 - Optical-fiber module and manufacturing method therefor - Google Patents

Optical-fiber module and manufacturing method therefor Download PDF

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Publication number
WO2014168187A1
WO2014168187A1 PCT/JP2014/060333 JP2014060333W WO2014168187A1 WO 2014168187 A1 WO2014168187 A1 WO 2014168187A1 JP 2014060333 W JP2014060333 W JP 2014060333W WO 2014168187 A1 WO2014168187 A1 WO 2014168187A1
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WO
WIPO (PCT)
Prior art keywords
window
adhesive
optical fiber
portion
optical
Prior art date
Application number
PCT/JP2014/060333
Other languages
French (fr)
Japanese (ja)
Inventor
夏野 靖幸
Original Assignee
コニカミノルタ株式会社
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Publication date
Priority to JP2013-081747 priority Critical
Priority to JP2013081747 priority
Application filed by コニカミノルタ株式会社 filed Critical コニカミノルタ株式会社
Publication of WO2014168187A1 publication Critical patent/WO2014168187A1/en

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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/24Coupling light guides
    • G02B6/36Mechanical coupling means
    • G02B6/38Mechanical coupling means having fibre to fibre mating means
    • G02B6/3807Dismountable connectors, i.e. comprising plugs
    • G02B6/3833Details of mounting fibres in ferrules; Assembly methods; Manufacture
    • G02B6/3855Details of mounting fibres in ferrules; Assembly methods; Manufacture characterised by the method of anchoring or fixing the fibre within the ferrule
    • G02B6/3861Adhesive bonding
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/24Coupling light guides
    • G02B6/36Mechanical coupling means
    • G02B6/38Mechanical coupling means having fibre to fibre mating means
    • G02B6/3807Dismountable connectors, i.e. comprising plugs
    • G02B6/3833Details of mounting fibres in ferrules; Assembly methods; Manufacture
    • G02B6/3834Means for centering or aligning the light guide within the ferrule
    • G02B6/3838Means for centering or aligning the light guide within the ferrule using grooves for light guides

Abstract

By preventing air bubbles and dust from becoming embedded in an adhesive on an end face of an optical fiber, the present invention improves the optical quality of a fiber module that comprises an optical ferrule affixed to an end section of the aforementioned optical fiber and is provided with a window section that protects the aforementioned end face. Said optical ferrule has a window-adhesive-section-connected passage (17) that connects to a window-adhesive section (C), between the end face (1a) of the optical fiber (1) and the window section (2), that gets filled with an adhesive (b). Said window-adhesive-section-connected passage extends backwards, in the direction where a ferrule hole (11) is, from the window-adhesive section. At least the end section (17a) of the window-adhesive-section-connected passage facing away from the window-adhesive section is open to the surface (14) of components constituting the optical ferrule. The end section of the optical fiber is inserted into the ferrule hole, the window-adhesive section is filled with the abovementioned adhesive, excess adhesive is made to flow from the window-adhesive section into the window-adhesive-section-connected passage together with air bubbles and/or dust, and the adhesive is then solidified, bonding the end face of the optical fiber to the inside surface of the window section.

Description

Optical fiber module and manufacturing method thereof

The present invention relates to an optical fiber module in which an optical ferrule is fixed to an end of an optical fiber, and a method for manufacturing the same.

Conventionally, as described in Patent Documents 1 and 2, in order to optically connect an optical fiber and another optical system, a structure in which an optical ferrule is fixed to an end portion of the optical fiber is employed.
In Patent Document 1, a ferrule having a through hole for guiding an optical fiber and having a cavity filled with an adhesive in the middle of the hole is used, and the tip of the optical fiber is exposed on the end face of the ferrule. Arranged.
The optical ferrule described in Patent Document 2 has a structure in which an optical fiber is inserted and held in a ferrule hole formed deep in the axial direction.
On the other hand, it is a general practice to observe or magnify a part that cannot be directly seen with the naked eye, such as the back side of an object or the inside of a tube, using an endoscope regardless of industrial / medical use.
Because the endoscope uses a thin and long tube to transfer images, in addition to an electronic endoscope with an image sensor installed at the distal end, an image fiber transmits the image from the distal end to the proximal end as described in Patent Document 3. There are optical fiber endoscopes, etc., which are expensive.
In recent years, with the advent of low-priced, high-quality plastic image fibers (those with a small fiber strand diameter), it has become possible to provide inexpensive and high-performance optical fiber endoscopes.
However, plastic fibers are softer than glass fibers and are easily damaged, and dust is liable to adhere due to charging.
In Patent Document 3, as a countermeasure, a protective plate (a “protective window 30” in the same document) made of a transparent member is disposed on the end face of the optical fiber and attached to the frame (the “housing 14”).

JP 2000-266957 A JP 2005-316292 A Japanese Patent Laid-Open No. 11-125775

An optical fiber module in which an optical ferrule described in Patent Documents 1 and 2 is fixed to an end of an optical fiber can be configured as an optical fiber endoscope by applying an image fiber as an optical fiber, and an optical ferrule at a base end Can be configured to connect to optical equipment.
In order to attach the protective plate to the image fiber, there is a method of fixing with an adhesive through a ferrule. However, if bubbles or dust enters the adhesive, an image defect is generated. Therefore, it is necessary to bond / assemble without air bubbles or dust.
However, in the structure of the optical ferrule described in Patent Document 1, although the optical fiber and the ferrule are bonded and fixed, the tip of the optical fiber is disposed so as to be exposed at the end face of the ferrule. Lack of protection and damage to the input / output surface of the optical fiber causes image defects, and the optical quality cannot be maintained.
In the structure of the optical ferrule described in Patent Document 2, since the ferrule hole into which the optical fiber with the coating peeled is inserted has a small and deep hole diameter, it is difficult to bond without bubbles or dust. Therefore, it is difficult to manufacture a high optical quality product with a high yield.

The present invention has been made in view of the problems in the prior art described above, and is an optical fiber module in which an optical ferrule is fixed to an end portion of an optical fiber and a window portion for protecting the end surface of the optical fiber is provided. It is an object of the present invention to improve the optical quality by preventing air bubbles and dust from being fixed in the adhesive.

The invention according to claim 1 for solving the above-mentioned problem comprises an optical fiber, and an optical ferrule in which a ferrule hole for holding the end of the optical fiber is formed and fixed to the end of the optical fiber, and further a transparent member An optical fiber module comprising a window portion that is configured as a bottom portion of the ferrule hole and protects an end face of the optical fiber,
The end face of the optical fiber and the inner surface of the window portion are bonded,
The optical ferrule is formed with a window adhesive portion communication path that communicates with a window adhesive portion that is a portion filled with an adhesive between the end face of the optical fiber and the window portion,
The window adhering portion communication path extends to the rear side where the ferrule hole is located with respect to the window adhering portion, and at least the opposite end of the window adhering portion is opened to the surface of the component part of the optical ferrule. It is an optical fiber module characterized by being.

The invention according to claim 2 is the optical fiber module according to claim 1, wherein the end portion of the window adhesion portion communication path is opened to a rear surface of the optical ferrule.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the end portion of the window bonding portion communication path is opened through a mating surface of two parts constituting the optical ferrule. The optical fiber module described.

The invention according to claim 4 is the optical fiber module according to any one of claims 1 to 3, wherein the optical ferrule includes a plurality of the window adhesive portion communication paths.

The invention according to claim 5 is the optical fiber module according to any one of claims 1 to 4, wherein the window portion and the optical ferrule are integrally formed.

The invention according to claim 6 is the optical fiber module according to any one of claims 1 to 4, wherein the window portion and the optical ferrule are configured as separate parts.

According to a seventh aspect of the present invention, in the window adhesive portion communication path, an adhesive reservoir portion having an enlarged cross-sectional area is formed. The optical fiber module.

The invention according to claim 8 is provided with an optical fiber and an optical ferrule in which a ferrule hole for holding an end of the optical fiber is formed and fixed to the end of the optical fiber, and further comprises a transparent member and is formed at the bottom of the ferrule hole. And a manufacturing method for manufacturing an optical fiber module provided with a window portion for protecting the end face of the optical fiber,
As the optical ferrule, a window adhesive portion communication path that communicates with a window adhesive portion that is a portion filled with an adhesive between the end face of the optical fiber and the window portion is formed, and the window adhesive portion communication path is The ferrule hole is extended to the rear side with respect to the window adhesive portion, and at least the opposite end of the window adhesive portion of the window adhesive portion communication path is opened to the surface of the component part of the optical ferrule Use things
After inserting the end of the optical fiber into the ferrule hole, filling the window adhesive part with an adhesive, and flowing excess adhesive from the window adhesive part together with bubbles and dust into the window adhesive part communication path, In the optical fiber module manufacturing method, the adhesive is solidified to bond the end face of the optical fiber and the inner surface of the window portion.

The invention according to claim 9 comprises the window part and the optical ferrule as separate parts,
The window adhesive portion is filled with an adhesive by aligning the end surface of the optical fiber disposed at the tip opening of the ferrule hole and the inner surface of the window portion with an adhesive, and excess adhesive is added to the window. 9. The method of manufacturing an optical fiber module according to claim 8, wherein after flowing into the bonding portion communication path, the adhesive is solidified to bond the end surface of the optical fiber and the inner surface of the window portion.

The invention according to claim 10 uses, as the optical ferrule, one provided with a plurality of the window adhesive portion communication passages,
Adhesive agent is filled into the window adhesive portion through one of the window adhesive portion communication passages, and excess adhesive is caused to flow into the other one of the window adhesive portion communication passages. The method of manufacturing an optical fiber module according to claim 8, wherein an end surface and an inner surface of the window portion are bonded.

According to the eleventh aspect of the present invention, in order to cause the excess adhesive to flow into the window adhesive portion communication passage, the window adhesive portion communication passage is formed in a capillary tube in advance, and the capillary of the window adhesive portion communication passage is formed. The method according to any one of claims 8 to 10, wherein the method is performed according to a phenomenon.

According to a twelfth aspect of the present invention, the excess adhesive is caused to flow into the window adhesive portion communication path by suction by applying a negative pressure to the window adhesive portion communication path from the outside. It is a manufacturing method of the optical fiber module according to any one of claims 8 to 10.

The invention according to claim 13 causes the excess adhesive to flow into the window adhesion part communication path by suction by applying a negative pressure to the window adhesion part communication path from the outside,
The method of manufacturing an optical fiber module according to claim 10, wherein filling of the adhesive into the window adhesive portion and suction of the adhesive from the window adhesive portion are repeated simultaneously or alternately.

In the invention according to claim 14, from the window adhesive portion to the window adhesive portion communication path, the bubble and dust in the range are reduced while observing the input / output optical path range of the optical fiber in the window adhesive portion. The method of manufacturing an optical fiber module according to any one of claims 8 to 13, wherein the flow of the adhesive is controlled.

The invention according to claim 15 is the method of manufacturing an optical fiber module according to claim 14, wherein the observation is performed using a magnifying optical system or an electronic camera.

According to a sixteenth aspect of the present invention, the observation is performed by causing the illumination light for the observation to enter from an end surface opposite to the end surface facing the window portion of the optical fiber. Item 16. A method for manufacturing an optical fiber module according to Item 15.

The invention according to claim 17 uses a photo-curing adhesive or a thermosetting adhesive as the adhesive, and the method of manufacturing an optical fiber module according to any one of claims 8 to 16. It is.

The optical fiber according to any one of claims 8 to 17, wherein the optical fiber according to claim 18 is executed with a polishing step of polishing an outer surface of the window portion after the adhesive is solidified. It is a manufacturing method of a module.

The invention according to claim 19 is the method of manufacturing an optical fiber module according to claim 18, wherein a protective coat is applied to an outer surface of the window portion polished by the polishing step.

According to the present invention, in the bonding process between the end face of the optical fiber and the window portion that protects the end face, an extra adhesive from the window adhesive portion that is a portion filled with the adhesive between the end face of the optical fiber and the window portion. Is allowed to flow into the window adhesive part communication path together with air bubbles and dust, thereby discharging the air bubbles and dust from the window adhesive part, preventing the bubbles and dust from being fixed in the adhesive on the end face of the optical fiber, and improving the optical quality. be able to.

It is a front view of the optical ferrule applied to 1st Embodiment of this invention. It is a longitudinal cross-sectional view of the optical ferrule applied to 1st Embodiment of this invention. It is a rear view of the optical ferrule applied to 1st Embodiment of this invention. It is sectional drawing which shows the adhesion process of an example in the manufacturing method of the optical fiber module which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the adhesion process following FIG. 2A. It is sectional drawing which shows the adhesion process following FIG. 2B. It is sectional drawing which shows the adhesion process of another example in the manufacturing method of the optical fiber module which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the adhesion process following FIG. 3A. It is sectional drawing which shows the adhesion process following FIG. It is a longitudinal cross-sectional view of the optical ferrule tip component and optical fiber applied to the second embodiment of the present invention. It is a rear view of the optical ferrule tip part applied to 2nd Embodiment of this invention. It is a longitudinal cross-sectional view of the optical ferrule and optical fiber applied to 3rd Embodiment of this invention. FIG. 5B is a cross-sectional view taken along the line AA described in FIG. 5A. It is a disassembled perspective view of the optical fiber module which concerns on 4th Embodiment of this invention. It is a figure which shows the component matching surface of the optical fiber module which concerns on 4th Embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The following is one embodiment of the present invention and does not limit the present invention.

[First Embodiment]
First, referring to FIG. 1A, FIG. 1B, FIG. 1C, FIG. 2A, FIG. 2B, FIG. 2C, FIG. 3A, FIG. 3B, and FIG. The manufactured optical fiber module will be described.
1A, 1B and 1C show an optical ferrule 10 applied to the present embodiment.
The optical ferrule 10 has a cylindrical structure in which a ferrule hole 11 that holds an end of an optical fiber is formed. The optical fiber is inserted and held in the ferrule hole 11, and the optical ferrule 10 is fixed to the end of the optical fiber. The side on which the tapered surface 12 is provided is the tip of the optical ferrule 10. The tapered surface 12 is followed by the rear surface 14 via the outer peripheral surface 13. A concave portion 16 that is recessed backward from the foremost surface 15 is formed at the center of the tip portion. On the inner peripheral surface of the ferrule hole 11, a window bonding portion communication path 17 is formed in a groove shape along the axial direction of the ferrule hole 11. One end of the ferrule hole 11 and the window adhesive portion communication path 17 opens into the recess 16, and the other end opens into the rear surface 14.

As a manufacturing method, as shown in FIGS. 2A, 2B and 2C, the window portion 2 is bonded to the concave portion 16 of the optical ferrule 10 in which the optical fiber 1 is inserted into the ferrule hole 11. The window portion 2 is a member that is installed in the recessed portion 16 so as to close the ferrule hole 11 and the window adhesion portion communication path 17 and serves as a bottom portion of the ferrule hole 11. The window portion 2 protects the end surface 1 a of the optical fiber 1 and is made of a transparent member, and transmits light emitted from the end surface 1 a of the optical fiber 1 and light incident on the end surface 1 a of the optical fiber 1.
First, the optical fiber 1 is inserted into the ferrule hole 11, and the end surface 1 a of the optical fiber 1 is disposed on the bottom surface of the recess 16. At this time, the optical fiber 1 may be bonded to the ferrule hole 11, but the window bonding portion communication path 17 is not blocked by the adhesive at that time.
Next, the window portion 2 is bonded as shown in FIG. 2A → FIG. 2B → FIG. 2C. That is, as shown in FIG. 2A, the adhesive b is applied to the inner surface 2 a of the window portion 2 and / or the end surface 1 a of the optical fiber 1. The adhesive b is held in a convex shape by its surface tension. Although the handling method of the window part 2 is not ask | required, the case where it hold | maintains by the adsorption | suction holding means 3 is illustrated.
Next, as shown in FIG. 2A → FIG. 2B → FIG. 2C, the window portion 2 and the concave portion 16 are brought close to each other, and the inner surface 2a of the window portion 2 and the end surface 1a of the optical fiber 1 are brought together through an adhesive b. At this time, a part of the adhesive b is caused to flow into the window adhesive portion communication path 17. By causing bubbles and dust to flow together with the excess adhesive b flowing in the window bonding portion communication path 17, bubbles and dust are formed between the end face 1 a of the optical fiber 1 and the window portion 2, particularly from the input / output optical path range of the optical fiber 1. The optical quality is improved by preventing air bubbles and dust from being fixed in the adhesive on the end face 1a of the optical fiber 1.
Then, the optical fiber module of this embodiment is comprised by solidifying the adhesive agent b and adhere | attaching the end surface 1a of the optical fiber 1, and the inner surface 2a of the window part 2. FIG. In this embodiment, the adhesive b is also filled and bonded between the inner surface of the recess 16 and the window portion 2.

As shown in FIG. 2C, the portion filled with the adhesive b between the end face 1 a of the optical fiber 1 and the window portion 2 constitutes the window adhesive portion C. That is, the window adhesive portion C is a gap portion filled with an adhesive that bonds the end surface 1 a of the optical fiber 1 and the window portion 2.
The window bonding portion communication path 17 communicates with the window bonding portion C and extends to the rear side where the ferrule hole 11 is located with respect to the window bonding portion C. At least an end portion 17 a (see FIG. 1B) on the opposite side of the window adhesive portion C of the window adhesive portion communication path 17 is open to the surface of the component 10 of the optical ferrule 10. In the present embodiment, since the optical ferrule 10 has a one-part configuration, the end portion 17 a is open to the rear surface 14 of the optical ferrule 10. In order to optically connect the optical ferrule 10 to other components in order to optically connect the optical fiber 1 to another optical system, it is not preferable to open the end portion 17a on the tapered surface 12 or the outer peripheral surface 13. The end portion 17a is opened to the rear surface 14 of the optical ferrule 10.

The flow of the adhesive b to the window adhesive portion communication path 17 can be performed by utilizing a capillary phenomenon or by suction. In particular, capillary action can be effectively used when the viscosity of the adhesive b is low, and suction can be effectively used when the viscosity is high.
When the capillary phenomenon is used, the flow path cross-sectional area of the window bonding portion communication path 17 is previously formed into a capillary tube that is sufficiently small so that the capillary phenomenon occurs due to the surface tension of the adhesive b used.
When suction is performed, a negative pressure source is connected to the end portion 17 a of the window bonding portion communication path 17.
The flow of the adhesive from the window adhesive portion C to the window adhesive portion communication path 17 can be controlled by the amount of pressing the window portion 2 against the concave portion 16 during the bonding operation. Also, when utilizing the capillary phenomenon, the flow of the adhesive b into the window adhesive portion communication passage 17 can be suppressed by closing the end portion 17a of the window adhesive portion communication passage 17, and the end portion 17a is opened. By doing so, the flow of the adhesive b can be promoted, whereby the flow of the adhesive from the window adhesive portion C to the window adhesive portion communication path 17 can be controlled. When suction is performed, the flow of the adhesive b from the window adhesive part C to the window adhesive part communication path 17 can be controlled by controlling the negative pressure applied to the window adhesive part communication path 17.

In order to more reliably discharge air bubbles and dust from the window adhesive portion C, particularly the input / output optical path range of the optical fiber 1, the input / output optical path range of the optical fiber 1 in the window adhesive portion C is observed. The input / output optical path range of the optical fiber 1 in the window bonding portion C is a path range of light emitted from the end face 1a between the end face 1a and the inner surface 2a and a path range of light incident on the end face 1a from the outside.
While observing the input / output optical path range of the optical fiber 1 in the window adhesive portion C by using a magnifying optical system or an electronic camera, the window adhesive portion C is connected to the window adhesive portion so that bubbles and dust in the range are reduced. The flow of the adhesive b into the passage 17 is controlled by any of the methods described above. As the magnifying optical system, a magnifying glass or an optical microscope is applied. When using an electronic camera, it is needless to say that an apparatus equipped with a magnifying optical system may be applied. Thus, bubbles and dust that are difficult to identify with the naked eye are observed.

As the adhesive b, in addition to a photo-curable adhesive or a thermosetting adhesive, a two-component mixed adhesive or an anaerobic adhesive can be applied. Among them, as the adhesive b, it is preferable to use a photocurable adhesive or a thermosetting adhesive. It is because it can be cured by applying light or heat as curing energy after ensuring the discharge of bubbles and dust. Specific examples of the component include an epoxy adhesive (two-component mixing property) and an acrylic adhesive.
In order to hold a sufficient amount of adhesive b on the inner surface 2a of the window 2 and / or the end surface 1a of the optical fiber 1 in the stage shown in FIG. 2A, the adhesive b has thixotropy. It is preferable to apply the agent. Since the adhesive b has thixotropy, a sufficient amount of the adhesive b can be applied, and the adhesive b is less likely to drip or swing as shown in FIGS. 2A → 2B → FIG. 2C. The bonding operation for bringing the window portion 2 and the concave portion 16 closer is facilitated.

When the adhesive b has no thixotropy and has a low viscosity, as shown in FIG. 3A, by filling the concave portion 16 with the concave portion 16 facing upward, a sufficient filling amount can be secured, and the bonding work Can also be done easily.
In this case, as shown in FIG. 3A → FIG. 3B → FIG. 3C, by placing the window portion 2 obliquely with respect to the concave portion 16, air bubbles are mixed between the window portion 2 and the end surface 1a. Can be reduced.
Also in this case, from the window adhesive portion C, the air bubble and dust in the range are reduced while observing the input / output optical path range of the optical fiber 1 in the window adhesive portion C by using an magnifying optical system or an electronic camera. The flow of the adhesive b to the window bonding part communication path 17 is controlled by any of the methods described above.

As described above, the optical fiber module of the present embodiment includes the optical fiber 1 and the optical ferrule 10 in which the ferrule hole 11 that holds the end of the optical fiber 1 is formed and fixed to the end of the optical fiber 1, and is further made of a transparent member. A window portion 2 that is configured and becomes the bottom portion of the ferrule hole 11 and protects the end surface 1a of the optical fiber 1 is provided, and the end surface 1a of the optical fiber 1 and the inner surface 2a of the window portion 2 are bonded to each other. A window adhesive portion communication path 17 communicating with the window adhesive portion C, which is a portion filled with the adhesive b between the end surface 1a of the window 2 and the window portion 2, is formed. The ferrule hole 11 extends to the rear side, and at least the end 17a on the opposite side of the window adhesive portion C opens to the surface (rear surface 14) of the component 10 of the optical ferrule 10. To have. The window part 2 and the optical ferrule 10 are comprised by another component.
The adhesive b is continuously filled in the window adhesive portion communication passage 17 in the window adhesive portion C and solidified, and the discharge of bubbles and dust from the window adhesive portion C to the window adhesive portion communication passage 17 is controlled. Thus, a very small amount of air bubbles and dust that are unavoidable in advance from the adhesive are also unevenly distributed in the window adhesive portion communication path 17 rather than the window adhesive portion C, and the adhesive is solidified in this state. It is possible to prevent air bubbles and dust from being fixed in the adhesive on the end surface 1a of the 1 and to exhibit high optical quality.

[Second Embodiment]
Next, with reference to FIG. 4A and FIG. 4B, the manufacturing method of the optical fiber module of 2nd Embodiment of this invention and the optical fiber module manufactured by this are demonstrated.
4A and 4B show the optical ferrule tip part 20 and the optical fiber 1 applied to this embodiment.
The optical ferrule tip part 20 has a cylindrical structure in which a ferrule hole 21 that holds the end of the optical fiber 1 is formed. The optical fiber 1 is inserted and held in the ferrule hole 21, and the optical ferrule tip part 20 is fixed to the end of the optical fiber 1. The side on which the tapered surface 22 is provided is the tip of the optical ferrule tip part 20. The taper surface 22 is followed by the rear surface 24 via the outer peripheral surface 23. The window 4 is integrally formed at the center of the tip, and the foremost surface 25 includes the outer surface 4 b of the window 4. Two window adhesive portion communication passages 26 and 27 each having one end opened on the inner peripheral surface of the ferrule hole 21 are formed in a tunnel shape. The rear ends of the ferrule hole 21 and the window adhesive portion communication passages 26 and 27 open to the rear surface 24.

The front end 26 b of the window bonding part communication path 26 and the front end 27 b of the window bonding part communication path 27 are arranged at different positions in the axial direction of the ferrule hole 21. By arranging them at different positions in this way, the strength and rigidity of the tip of the optical ferrule tip component 20 arranged around the end of the optical fiber 1 can be ensured. The front end 26 b of the window bonding portion communication path 26 is formed up to the inner surface 4 a of the window portion 4 which is also the bottom surface of the ferrule hole 21. The front end 27b of the window bonding portion communication path 27 is disposed so as to recede from the rear side. As described above, in order to ensure the strength and rigidity of the tip portion of the optical ferrule tip component 20, it is preferable that the formation ranges do not overlap in the axial direction of the ferrule holes 21 of the two front ends 26b and 27b.
In the manufacturing method of the present embodiment, the window adhesive portion communication path 26 having the front end 26b closer to the bottom surface of the ferrule hole 21 is used as an adhesive injection path, and the window adhesive portion communication path 27 is used as an adhesive discharge path. However, it is also possible to use the window adhesive portion communication path 27 as an adhesive injection path and the window adhesive portion communication path 26 as an adhesive discharge path.

As described above, the optical ferrule tip part 20 of the present embodiment includes a plurality of window bonding part communication paths, and the window part 4 and the optical ferrule tip part 20 are integrally formed. Further, the optical ferrule is configured by joining the optical ferrule tip part 20 and the optical ferrule rear part 30. The optical ferrule rear end part 30 is a cylindrical member having a through-hole continuous with the ferrule hole 21. The rear end portions 26a and 27a of the window bonding portion communication passages 26 and 27 are open to the mating surfaces of the two parts 20 and 30 constituting the optical ferrule.
When the entire part corresponding to the two parts 20 and 30 is formed by integral molding to form an optical ferrule having a single part structure, the window adhesive portion communication paths 26 and 27 are extended to the rearmost end face of the entire optical ferrule. And open. However, by dividing into two parts like this embodiment, the window adhesion part communication paths 26 and 27 can be shortened, and the filling of an adhesive becomes easy.

As a manufacturing method, before assembling the component 20 and the component 30, first, the optical fiber 1 is inserted into the ferrule hole 21, and the end surface 1 a of the optical fiber 1 is brought into contact with the inner surface 4 a of the window 4 that is also the bottom surface of the ferrule hole 21. Touch. In this state, the adhesive is filled through the window adhesive portion communication passage 26, while excess adhesive is caused to flow in the window adhesive portion communication passage 27. In this process, the adhesive permeates between the end surface 1 a of the optical fiber 1 and the inner surface 4 a of the window portion 4, or between the outer peripheral surface of the optical fiber 1 and the inner peripheral surface of the ferrule hole 21. In addition, illustration of an adhesive agent is abbreviate | omitted in FIG. 4A and 4B.
By allowing bubbles and dust to flow along with the excess adhesive flowing in the window adhesive portion communication path 27, bubbles and dust are removed between the end face 1a of the optical fiber 1 and the window portion 4, particularly from the input / output optical path range of the optical fiber 1. The optical quality is improved by discharging and preventing air bubbles and dust from being fixed in the adhesive on the end face 1a of the optical fiber 1.
Next, the front surface of the optical ferrule rear end component 30 through which the optical fiber 1 is passed is aligned with the rear surface 24 of the optical ferrule front end component 20 via an adhesive.
Then, the optical fiber 1 and the parts 20 and 30 are bonded by solidifying the adhesive. Thereby, the end surface 1a of the optical fiber 1 and the inner surface 4a of the window part 4 are also bonded.

The flow of the adhesive to the window adhesive portion communication path 27 can be performed by utilizing a capillary phenomenon or by suction. In particular, capillary action can be effectively used when the viscosity of the adhesive is low, and suction can be effectively used when the viscosity is high.
When utilizing the capillary phenomenon, the flow path cross-sectional area of the window adhesive portion communication path 27 is previously formed into a capillary tube that is sufficiently small so that the capillary phenomenon occurs due to the surface tension of the adhesive used.
When suction is performed, a negative pressure source is connected to the end portion 27 a of the window bonding portion communication path 27.
The flow of the adhesive from the window adhesive part C to the window adhesive part communication path 27 can be controlled by the injection amount of the adhesive from the window adhesive part communication path 26. Further, when the capillary phenomenon is used, the flow of the adhesive into the window adhesive portion communication passage 27 can be suppressed by closing the end portion 27a of the window adhesive portion communication passage 27, and the end portion 27a is opened. Thus, the flow of the adhesive can be promoted, whereby the flow of the adhesive from the window adhesive portion C to the window adhesive portion communication path 27 can be controlled. When suction is performed, the flow of the adhesive from the window adhesive part C to the window adhesive part communication path 27 can be controlled by controlling the negative pressure applied to the window adhesive part communication path 27.

As in the first embodiment, while observing the input / output optical path range of the optical fiber 1 in the window bonding portion C by using an magnifying optical system or an electronic camera, the bubbles and dust in the range are reduced. The flow of the adhesive from the window adhesive portion C to the window adhesive portion communication path 27 is controlled by any of the methods described above.
In the case of controlling the flow of the adhesive by performing suction from the window adhesive portion communication path 27, a filling step for filling the adhesive from the window adhesive portion communication path 26, and sucking the adhesive from the window adhesive portion communication path 27 The sucking step to be performed may be performed simultaneously or may be performed alternately.

It is effective to perform observation during the flow control of the adhesive by making illumination light for observation enter from the end face 1b opposite to the end face 1a facing the window 4 of the optical fiber 1. In this case, observation is performed from the outer surface 4b side of the window portion 4 through the magnifying optical system or the electronic camera, and it is identified whether there is a defect in the light incident from the end surface 1b and emitted from the end surface 1a. Thereby, the optical quality of the optical fiber can be directly identified, and the optical quality can be improved efficiently without being confused by a phenomenon that does not affect the optical quality.

[Third Embodiment]
Next, with reference to FIG. 5A and FIG. 5B, the manufacturing method of the optical fiber module of 3rd Embodiment of this invention and the optical fiber module manufactured by this are demonstrated.
5A and 5B show the optical ferrule 40 and the optical fiber 1 applied to this embodiment.
This embodiment is an embodiment for specific illustration of a structure in which adhesive reservoir portions 46b and 47b having a cross-sectional area widened are formed in the window adhesive portion communication paths 46 and 47.
The window portion 4, its inner surface 4a, its outer surface 4b, and the window adhesive portion C are the same as those in the second embodiment and are denoted by common reference numerals.
Although the optical ferrule 40 of this embodiment has a one-part configuration, it may have a two-part configuration as in the second embodiment. In that case, only the tip part needs to form the window adhesive portion communication passages 46 and 47.

The optical ferrule 40 has a cylindrical structure in which a ferrule hole 41 that holds the end of the optical fiber 1 is formed. The optical fiber 1 is inserted and held in the ferrule hole 41, and the optical ferrule 40 is fixed to the end of the optical fiber 1. The side on which the tapered surface 42 is provided is the tip of the optical ferrule 40. The tapered surface 42 is followed by a rear surface 44 through the outer peripheral surface 43. The window 4 is integrally formed at the center of the tip, and the foremost surface 45 includes the outer surface 4 b of the window 4. Two window adhesive portion communication passages 46 and 47 each having one end opened on the inner peripheral surface of the ferrule hole 41 are formed in a tunnel shape. The rear ends of the ferrule hole 41 and the window bonding portion communication passages 46 and 47 open to the rear surface 44.

Adhesive reservoirs 46b and 47b are formed at the ends of the window adhesive portion communication passages 46 and 47 connected to the ferrule holes 41.
Here, the window adhesive portion communication path 46 is described as an adhesive injection path, and the window adhesive portion communication path 47 is described as an adhesive discharge path. In the process of filling the adhesive to bond the optical fiber 1 and the optical ferrule 40, the adhesive flows from the window adhesive portion communication path 46 to the ferrule hole 41 and further to the window adhesive portion communication path 47. The flow of the adhesive stagnates in the adhesive reservoirs 46b and 47b, and minute amounts of air bubbles and dust that cannot be removed from the adhesive in advance tend to stagnate in the adhesive reservoirs 46b and 47b. Thereby, it is possible to prevent bubbles and dust from being fixed in the adhesive on the end face 1a of the optical fiber 1 and to improve the optical quality. In order to obtain such an effect, it is not always necessary to form the adhesive reservoir portions 46b and 47b at the end portions connected to the ferrule holes 41 of the window adhesive portion communication passages 46 and 47. What is necessary is just to form an adhesive reservoir part in any location in the middle of the window bonding part communication paths 46 and 47.
Others are manufactured in the same manner as in the second embodiment by observing and controlling the flow of the adhesive.

In the optical fiber module of the present embodiment, since a relatively large amount of adhesive is disposed around the end of the optical fiber 1 by the adhesive reservoirs 46b and 47b, it is applied to the end of the optical fiber 1 by solidification shrinkage of the adhesive. There is also an effect that the generated stress can be relaxed.

[Fourth Embodiment]
Next, with reference to FIG.6 and FIG.7, the manufacturing method of the optical fiber module of 4th Embodiment of this invention and the optical fiber module manufactured by this are demonstrated.
FIG. 6 shows an optical ferrule 50 and an optical fiber 1 applied to this embodiment. The optical ferrule 50 includes a part 51 and a part 52. FIG. 7 shows a diagram of the component mating surface of the component 51 in a state where the optical fiber 1 is arranged.

The optical ferrule 50 includes a component 51 and a component 52. The end of the optical fiber 1 is held in a state of being inserted into the ferrule hole 60. The ferrule hole 60 is composed of two parts 51 and 52 to be assembled. A groove 53 is formed in the component 51, and a groove 54 is formed in the component 52. When the parts 51 and 52 are assembled, the groove 53 and the groove 54 are combined to form the ferrule hole 60.
One component 51 is provided with a window portion 55 that is a bottom portion of the ferrule hole 60. The window portion 55 has a function of protecting the end face 1a of the optical fiber 1 from contact that may cause dust adhesion or damage. The window part 55 is comprised with the transparent member, and the input / output of the light between the end surface 1a of the optical fiber 1 and the exterior is attained.
In the figure, reference numerals 56 and 57 denote parts mating surfaces, and 58 denotes a tapered surface formed at the tip of the ferrule.

Two window adhesive portion communication paths 61 and 62 are formed in a groove shape on the component mating surface 56 of the component 51 in which the window portion 55 is configured.
The two window bonding portion communication paths 61 and 62 are formed symmetrically with respect to the central axis of the ferrule hole 60. Adhesive reservoirs 61a and 62a are respectively formed at the rear end portions of the window bonding portion communication passages 61 and 62, and the front ends 61b and 62b open to the groove 53 at symmetrical positions. The window adhesion part communication path 61 and the window adhesion part communication path 62 are symmetrical and have the same volume.
Each of the window adhering portion communication paths 61 and 62 is open to the mating surface 56 of two parts constituting the optical ferrule.
In this embodiment, since the adhesive is filled using the capillary phenomenon, the window adhesive portion communication passages 61 and 62 are formed in a capillary shape except for the adhesive reservoir portions 61a and 62a.

Here, although it demonstrates as what is filled with an adhesive agent from the window adhesion part communication path 61, you may fill from any.
As shown in FIG. 7, the optical fiber 1 is disposed in the groove 53, and one adhesive reservoir 61a is filled with the adhesive. Then, due to capillary action, the adhesive sequentially flows into the window adhesive portion communication path 61, the gap between the inner surface of the groove 53 and the optical fiber 1, and the window adhesive portion communication path 62. In addition, illustration of an adhesive agent is abbreviate | omitted in FIG.
Adhesive flow occurs until pressure equilibrium in the capillary action arrives. By selecting the viscosity of the adhesive to be used in advance, the flow of the adhesive can be controlled.
As described above, the adhesive is filled in the gap between the window bonding portion C between the window portion 55 and the end surface 1 a of the optical fiber 1 and the inner surface of the groove 53 and the optical fiber 1.
While observing the window adhesive portion C as in the second embodiment, the flow of the adhesive from the window adhesive portion C to the window adhesive portion communication path 62 is caused by the amount of adhesive filled in the adhesive reservoir portion 61a. Control. By allowing bubbles and dust to flow together with excess adhesive flowing into the window adhesive portion communication path 62, bubbles and dust are discharged between the end face 1a of the optical fiber 1 and the window portion 55, particularly from the input / output optical path range of the optical fiber 1. In addition, the optical quality is improved by preventing the fixing of bubbles and dust in the adhesive on the end face 1a of the optical fiber 1.
Next, the adhesive is solidified to determine the adhesion between the end face 1a of the optical fiber 1 and the window portion 55 from which bubbles and dust are excluded.
Next, the ferrule hole 60 is completed by confining the end portion of the optical fiber 1 in the ferrule hole 60 by fixing the part aligning surface 57 of the other part 52 to the part aligning surface 56 of the part 51. At the same time, the window bonding portion communication paths 61 and 62 are confined inside the optical ferrule 50. The component 51 and the component 52 may be fixed by mechanical connection such as snap fit in addition to adhesion.

[Other supplementary explanations]
According to the second embodiment or the fourth embodiment, since the window bonding portion communication path is open to the component matching surface, the bonding operation can be easily performed before the components are aligned, and after the assembly is completed. The window bonding portion communication path is confined inside the optical ferrule, so that the adhesive and unnecessary openings are not exposed to the outside, and the connectivity of the optical ferrule is not affected.

In each of the embodiments described above, there is a risk that the surface accuracy of the window portion 2 (4, 55) may deteriorate due to assembly stress mainly due to solidification shrinkage of the adhesive.
When using a photocurable adhesive, the illuminance of the light (ultraviolet in the case of an ultraviolet curable adhesive) irradiated to the adhesive to cure the photocurable adhesive filled in the optical ferrule is kept low. By extending the minute irradiation time, it is possible to reduce the surface accuracy deterioration of the window 2 (4, 55) while securing the irradiation amount necessary for curing the adhesive.
In addition, the illuminance of light for curing the photocurable adhesive may be constant, but by increasing the intensity stepwise, it is possible to efficiently reduce surface accuracy degradation while shortening the irradiation time. .
Moreover, since the end surface 1a of the optical fiber 1 bonded to the optical ferrule is covered with the window portion 2 (4, 55) when the adhesive is filled in any of the above embodiments, the window portion 2 (4 , 55), by irradiating the photo-curable adhesive filled in the window adhesive portion C with light for curing it, a part of the light is cut by the window portion 2 (4, 55). As a result, the irradiation time becomes longer, and the surface accuracy deterioration of the window 2 (4, 55) can be reduced. In order to obtain this effect, in the case of an ultraviolet curable adhesive, it is preferable to apply an ultraviolet absorbing material to the window portion 2 (4, 55). In particular, the window portion 2 of the first embodiment, which is an independent component, is optimized by selecting an ultraviolet absorption property, other optical properties, and mechanical properties such as bending elastic modulus and combining them with an optical ferrule. Is easy.

Further, it is preferable to perform a polishing step of polishing the outer surface of the window portion 2 (4, 55) after the adhesive is solidified. After the adhesive is solidified, the surface accuracy of the outer surface can be secured at a high level by performing a polishing process on the outer surface of the window portion 2 (4, 55). Further, after the polishing step, it is preferable to apply a protective coating for preventing charging and preventing damage to the outer surface of the window portion 2 (4, 55). This is to maintain the optical quality by preventing dust from adhering to the outer surface of the window 2 (4, 55) and damaging the outer surface.

The optical fiber 1 is not particularly limited, and may include at least a single core and a surrounding clad, and a plurality of optical fibers 1 may be bundled. An image fiber is used for image transmission of an endoscope or the like. The optical fiber module may be used for any purpose such as optical communication, endoscope, and measurement.
When applied to medical optical fiber endoscopes (endoscope fiberscopes), demand for disposable (disposable) specifications can be expected from the hygiene aspect. In the case of a disposable specification, low cost is also required. Therefore, it is preferable to apply a plastic image fiber provided at a relatively low cost as the optical fiber 1.
Plastic fibers are softer and more easily scratched than glass fibers, and also have the problem that dust easily adheres to them. However, according to the optical fiber module of the present invention, the plastic fibers are covered and protected by the optical ferrule. Therefore, such problems are solved.

The present invention can be used for transmission of optical signals.

DESCRIPTION OF SYMBOLS 1 Optical fiber 2 Window part 4 Window part 10 Optical ferrule 11 Ferrule hole 14 Rear surface 17 Window adhesion part communication path 20 Optical ferrule tip component 21 Ferrule hole 24 Rear surface (component matching surface)
26, 27 Window adhesive part communication path 30 Optical ferrule rear end part 40 Optical ferrule 41 Ferrule hole 44 Rear surface 46, 47 Window adhesive part communication path 46b, 47b Adhesive reservoir part 50 Optical ferrule 51, 52 Optical ferrule part 55 Window part 56 Component alignment surface 57 Component alignment surface 60 Ferrule holes 61, 62 Window adhesive portion communication path 61a, 62a Adhesive reservoir portion b Adhesive C Window adhesive portion

Claims (19)

  1. And an optical ferrule that is formed with a ferrule hole that holds the end of the optical fiber and is fixed to the end of the optical fiber. An optical fiber module provided with a window,
    The end face of the optical fiber and the inner surface of the window portion are bonded,
    The optical ferrule is formed with a window adhesive portion communication path that communicates with a window adhesive portion that is a portion filled with an adhesive between the end face of the optical fiber and the window portion,
    The window adhering portion communication path extends to the rear side where the ferrule hole is located with respect to the window adhering portion, and at least the opposite end of the window adhering portion is opened to the surface of the component part of the optical ferrule. An optical fiber module characterized in that
  2. 2. The optical fiber module according to claim 1, wherein the end portion of the window bonding portion communication path is opened to a rear surface of the optical ferrule.
  3. 3. The optical fiber module according to claim 1, wherein the end portion of the window bonding portion communication path is opened to a mating surface of two parts constituting the optical ferrule.
  4. The optical fiber module according to any one of claims 1 to 3, wherein the optical ferrule includes a plurality of the window adhesive portion communication paths.
  5. The optical fiber module according to any one of claims 1 to 4, wherein the window portion and the optical ferrule are integrally formed.
  6. The optical fiber module according to any one of claims 1 to 4, wherein the window portion and the optical ferrule are configured as separate parts.
  7. The optical fiber module according to any one of claims 1 to 6, wherein an adhesive reservoir portion having an enlarged cross-sectional area is formed in the window adhesive portion communication path.
  8. And an optical ferrule that is formed with a ferrule hole that holds the end of the optical fiber and is fixed to the end of the optical fiber. A manufacturing method for manufacturing an optical fiber module provided with a window,
    As the optical ferrule, a window adhesive portion communication path that communicates with a window adhesive portion that is a portion filled with an adhesive between the end face of the optical fiber and the window portion is formed, and the window adhesive portion communication path is The ferrule hole is extended to the rear side with respect to the window adhesive portion, and at least the opposite end of the window adhesive portion of the window adhesive portion communication path is opened to the surface of the component part of the optical ferrule Use things
    After inserting the end of the optical fiber into the ferrule hole, filling the window adhesive part with an adhesive, and flowing excess adhesive from the window adhesive part together with bubbles and dust into the window adhesive part communication path, A method of manufacturing an optical fiber module, comprising solidifying an adhesive to bond an end face of the optical fiber and an inner surface of the window portion.
  9. The window portion and the optical ferrule are configured as separate parts,
    The window adhesive portion is filled with an adhesive by aligning the end surface of the optical fiber disposed at the tip opening of the ferrule hole and the inner surface of the window portion with an adhesive, and excess adhesive is added to the window. 9. The method of manufacturing an optical fiber module according to claim 8, wherein after flowing into the bonding portion communication path, the adhesive is solidified to bond the end surface of the optical fiber and the inner surface of the window portion.
  10. As the optical ferrule, a thing provided with a plurality of the window adhesion part communication path,
    Adhesive agent is filled into the window adhesive portion through one of the window adhesive portion communication passages, and excess adhesive is caused to flow into the other one of the window adhesive portion communication passages. The method of manufacturing an optical fiber module according to claim 8, wherein an end surface and an inner surface of the window portion are bonded.
  11. The excess adhesive is allowed to flow into the window adhesive portion communication path by forming the window adhesive portion communication path into a capillary tube in advance and performing capillary action in the window adhesive portion communication path. The manufacturing method of the optical fiber module as described in any one of Claims 8-10.
  12. The flow of the excess adhesive into the window adhesive portion communication path is performed by suction by applying a negative pressure to the window adhesive portion communication path from the outside. The manufacturing method of the optical fiber module as described in any one of them.
  13. The excess adhesive is caused to flow into the window adhesive portion communication path by suction by applying a negative pressure from the outside to the window adhesive portion communication path,
    The method for manufacturing an optical fiber module according to claim 10, wherein filling of the adhesive into the window adhesive part and suction of the adhesive from the window adhesive part are repeated simultaneously or alternately.
  14. Controlling the flow of the adhesive from the window adhesive portion to the window adhesive portion communication path while observing the input / output optical path range of the optical fiber in the window adhesive portion so as to reduce bubbles and dust in the range. The method of manufacturing an optical fiber module according to claim 8, wherein
  15. 15. The method of manufacturing an optical fiber module according to claim 14, wherein the observation is performed using a magnifying optical system or an electronic camera.
  16. 16. The optical fiber module according to claim 14, wherein the observation is performed by making illumination light for observation incident from an end surface opposite to an end surface facing the window portion of the optical fiber. Production method.
  17. The method for manufacturing an optical fiber module according to any one of claims 8 to 16, wherein a photocurable adhesive or a thermosetting adhesive is used as the adhesive.
  18. The method of manufacturing an optical fiber module according to any one of claims 8 to 17, wherein a polishing step of polishing an outer surface of the window portion is performed after the adhesive is solidified.
  19. The method of manufacturing an optical fiber module according to claim 18, wherein a protective coat is applied to an outer surface of the window portion polished by the polishing step.
PCT/JP2014/060333 2013-04-10 2014-04-09 Optical-fiber module and manufacturing method therefor WO2014168187A1 (en)

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