JP3428636B2 - Optical connector - 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 connector for assembling and fixing a single-core or multi-core optical fiber to a ferrule.

[0002]

2. Description of the Related Art As a conventional optical connector, a guide pin is inserted into a guide pin hole of a ferrule holding an optical fiber as described in, for example, Japanese Patent Application Laid-Open No. 9-68627, and an end face of the ferrule is inserted. It is known that the optical connectors are detachably connected to each other by joining them.

[0003]

However, in the above prior art, when the guide pin is inserted into the guide pin hole of the ferrule, the guide pin hits the inner wall surface portion forming the guide pin hole of the ferrule,
It is conceivable that that part may be chipped or raised. In this case, when the optical connectors are connected to each other, a gap is generated between the optical fibers, which may increase the optical connection loss.

It is an object of the present invention to provide an optical connector capable of preventing damage to a ferrule and the like when connecting the connector and reducing the optical connection loss.

[0005]

As a result of intensive studies by the present inventors, the ferrule often contains a filler such as silica from the viewpoint of improving strength and durability. , If the particle size of this filler is large, when the guide pin is inserted into the guide hole of the ferrule, the guide pin hits the inner wall surface portion forming the guide hole of the ferrule, and it is easy to damage the ferrule.
The present invention has been completed.

[0006]

That is, the present invention provides an optical connector provided with a ferrule having an optical fiber positioning hole extending inwardly from a connection end face and a pair of guide holes for inserting guide pins. , Flat
The average particle size is 20 μm or less and the maximum particle size is 40 μm or less
Add below silica to poniphenylene sulfide
The opening edge portion on the connection end face side forming a part of the guide hole has a surface roughness of 0.
It is characterized in that a chamfered portion of 01 to 2.0 μm is provided.

By forming the chamfered portion at the opening end that forms a part of the guide hole of the ferrule in this manner, the opening of the guide hole is widened, so that the guide pin can be easily inserted into the guide hole. At this time, the guide pin may hit the surface of the chamfer, but the ferrule has an average particle size.
Is 20 μm or less and the maximum particle size is 40 μm or less
Silica added to poniphenylene sulfide
The chamfered surface is smooth because it is formed by
Therefore , the chamfered part is less likely to be chipped or raised due to contact with the guide pin. Therefore, the guide pin can be accurately positioned in the guide hole. Also, the generation of abrasion powder due to the friction between the guide pin and the chamfer is reduced,
Damage to the optical fiber caused by the abrasion powder and the like adhering to the end face of the optical fiber is reduced. As described above, the optical connection loss when the optical connectors are connected to each other is reduced, and the attachment / detachment characteristics of the optical connectors are improved. When the average particle size of the filler is 20 μm or less, the moldability when forming the chamfered portion by die molding becomes good, and when the chamfered portion is formed by additional machining (drilling), Effective in reducing the wear amount of the drill and improving the durability. Furthermore
In addition, the surface roughness of the chamfered portion is 0.01 to 2.0 μm.
Therefore, regardless of the method of forming the chamfer,
Damage or wear of the chamfer when the pin hits the chamfer
It is possible to reliably reduce generation of powder and the like. The table here
The surface roughness is the center line average roughness defined by JIS etc.
That is.

[0008]

[0009]

[0010] good Mashiku is the opening diameter at the connection end face of the guide hole is configured such that 1.0~1.5mm when obliquely polished connection end face at an angle of 8 degrees. When the optical connector of the present invention is applied to the MPO connector (MT Push-on connector) in which the ferrule is housed in the housing, when the guide pin provided on the mating optical connector is inserted into the guide hole, the housing The guide pin may be displaced from the central axis of the guide hole due to backlash. Even in such a case, the guide pin can be surely inserted into the guide hole by configuring the opening diameter of the guide hole as described above.

Further, preferably, the chamfer angle of the chamfer is 90 to 150 degrees. The optical connector of the present invention is MPO
When applied to a connector, in a general MPO connector with a guide pin, the guide pin projects about 2 mm from the connection end face of the ferrule. Even with such a configuration, by configuring the chamfer angle of the chamfered portion as described above, when the guide pin provided on the mating optical connector is inserted into the guide hole, the guide pin is stable and It is held by the ferrule with high positioning accuracy. Also, if the chamfer angle of the chamfer is set as above,
A sufficient opening diameter at the connection end face of the guide hole described above can be secured.

The guide hole is formed on the first hole having a diameter substantially equal to that of the guide pin and on the side opposite to the connection end face side of the first hole, and has a larger diameter than the first hole. And a second hole portion. In a ferrule with a guide hole,
The guide hole may shrink slightly due to the effect of molding the ferrule. In such a case, when the guide pin is inserted into the guide hole from the connection end surface side, the rear end of the guide pin may hit the inner wall surface of the ferrule forming the guide hole, and the guide pin may not be accurately positioned. is there. Therefore, by providing the second hole portion in the guide hole, the rear end of the guide pin is prevented from coming into contact with the inner wall surface portion of the ferrule forming the guide hole.
It is possible to position the guide pin accurately while holding the guide pin with good stability at the first hole portion of the ferrule.

Further, the present invention provides an optical connector including a ferrule having an optical fiber positioning hole extending inward from a connection end face and a pair of guide holes, and a pair of guide pins inserted into the respective guide holes. , The ferrule has an average particle size of 20 μm or less and a maximum particle size of 40.
Silica that is less than μm to poniphenylene sulfide
It is formed by adding the surface roughness to the opening edge on the connection end face side that forms part of the guide hole.
Is provided with a chamfered portion of 0.01 to 2.0 μm ,
The guide pin is characterized in that a rounded curved surface portion is provided at an end portion of the guide pin.

By forming the chamfered portion at the opening end that forms a part of the guide hole of the ferrule in this manner, the opening of the guide hole is widened, so that the guide pin can be easily inserted into the guide hole. At this time, the guide pin may hit the surface of the chamfer, but the ferrule has an average particle size.
Is 20 μm or less and the maximum particle size is 40 μm or less
Silica added to poniphenylene sulfide
The chamfered surface is smooth because it is formed by
Therefore , the chamfered part is less likely to be chipped or raised due to contact with the guide pin. Therefore, the guide pin can be accurately positioned in the guide hole. Also, the generation of abrasion powder due to the friction between the guide pin and the chamfer is reduced,
Damage to the optical fiber caused by the abrasion powder and the like adhering to the end face of the optical fiber is reduced. Further, by rounding the tip portion of the guide pin, abrasion powder and the like due to friction when the guide pin hits the chamfered portion is further reduced. As described above, the optical connection loss when the optical connectors are connected to each other is reduced, and the attachment / detachment characteristics of the optical connectors are improved. When the average particle size of the filler is 20 μm or less, the moldability when forming the chamfered portion by die molding becomes good, and when the chamfered portion is formed by additional machining (drilling), Effective in reducing the wear amount of the drill and improving the durability. In addition, the surface roughness of the chamfer
Chamfered portion by adjusting the thickness to 0.01 to 2.0 μm
Guide pin hits the chamfer regardless of the formation method
When chamfering, be sure to avoid damage to chamfered parts and generation of abrasion powder, etc.
It can be reduced.

Preferably, the guide pin is fixed to the ferrule in a state in which the tip end side is inserted into the guide hole so as to protrude from the connecting end face by a predetermined length. This allows
It is possible to obtain an optical connector with a guide pin that has stable attachment / detachment characteristics.

Preferably, the diameter of the guide pin is approximately 0.7 mm, and the length from the base of the curved surface portion to the tip of the guide pin is 0.1 to 0.35 mm. As a result, generation of abrasion powder and the like due to friction when the guide pin hits the chamfered portion is further suppressed.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of an optical connector according to the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing the appearance of the optical connectors according to the present embodiment. FIG. 1A shows a state before the optical connectors are connected to each other, and FIG. It shows the state of being done.

In the figure, the optical connectors 1A and 1B are
As the MPO connector, the optical connector 1A is configured as a connector without guide pins, and the optical connector 1B is configured as a connector with guide pins. Such optical connectors 1A and 1B are detachably connected via the adapter 2.

The optical connector 1A has a ferrule 3A, and a single-core or multi-core (here, 8 cores) optical fiber tape core wire 4A is attached to the ferrule 3A. The optical connector 1B has a ferrule 3B, and an optical fiber tape core wire 4B having the same number of cores as the optical fiber tape core wire 4A is attached to the ferrule 3B. These ferrules 3A and 3B are housed in housings 5A and 5B, respectively.

The ferrules 3A and 3B are made of, for example, PP which is a plastic in order to improve strength and durability.
It is formed by adding silica, which is a filler, to S (polyphenylene sulfide). The mixing ratio (weight ratio) of these substances is, for example, PPS.
Is 30% and silica is 70%. The specific configuration of the ferrule 3A is shown in FIGS.

In these figures, the ferrule 3A is
It has eight optical fiber positioning holes 7 extending inward from a connection end face (front end face) 6 joined to the mating optical connector 1B. A tape core wire accommodating hole portion 9 is communicated with the optical fiber positioning hole 7 through an optical fiber positioning groove 8. When assembling the optical fiber tape core wire 4A to such a ferrule 3A, the tape core wire 4A is inserted into the tape core wire storage hole portion 9 from the rear end face side of the ferrule 3A and is exposed from the tip of the tape core wire 4A. Further, eight optical fibers are inserted into the optical fiber positioning hole 7. Then, the optical fiber is fixed to the ferrule 3A by filling an adhesive through the opening 10 formed on the upper surface of the ferrule 3A. Thus, the tape core wire 4
After A is assembled to the ferrule 3A, the front end face 6 of the ferrule 3A is obliquely polished at an angle of 8 degrees (FIG. 4,
(See the chain double-dashed line in FIG. 5). As a result, the influence of reflected return light due to Fresnel reflection or the like is reduced when the connector is connected.

On both sides of the optical fiber positioning hole 7, there are formed a pair of guide holes 11 extending inward from the front end surface 6 of the ferrule 3A in parallel to the optical fiber positioning hole 7. 11 is an optical connector 1B
A guide pin 12 (described later) provided on the is inserted.

The ferrule 3B of the optical connector 1B is shown in FIG.
As shown in FIG. 7, the ferrule 3A has the same structure as the ferrule 3A of the optical connector 1A described above, and the guide pin 12 is inserted and fixed in the guide hole 11 of the ferrule 3B. At this time, the guide pin 12 is
It is fixed to the ferrule 3B while being inserted into the guide hole 11 so as to protrude from the front end face 6 to some extent.

A chamfered portion 13 is formed at an opening edge portion of the ferrules 3A and 3B forming a part of the guide hole 11 on the front end face 6 side, and the opening of the guide hole 11 is formed on the front end face 6 side. It is getting wider.

The opening diameter R of the front end face 6 of the guide hole 11 is preferably configured to be 1.0 to 1.5 mm when the front end face 6 is obliquely polished (described above) at an angle of 8 degrees. (See Figure 4). Since the MPO connector has a structure in which the ferrule is housed in the housing as described above, when the guide pin 12 of the optical connector 1B is inserted into the guide hole 11 for connector connection, the guide is provided by the play of the housing 5 or the like. The central axis of the pin 12 is the guide hole 1
It may deviate from the central axis of 1. This deviation is
It is considered to be about 0.15 to 0.4 mm. Therefore, it is necessary to secure at least that amount as the chamfering amount. On the other hand, the diameter of the guide pin 12 is 0.7 m.
Since it is determined to be about m, the diameter of the guide hole 11 is also about 0.7 mm. Considering the above points, it is preferable that the opening diameter R of the front end face 6 of the guide hole 11 be within the above range.

Further, the chamfer angle θ of the chamfered portion 13 is preferably 90 to 150 degrees (see FIG. 4). As described above, the guide pin 12 of the optical connector 1 has the ferrule 3
It protrudes from the front end surface 6 of B by about 2 mm. In order to position the guide pin 12 accurately and stably when the guide pin 12 is inserted into the guide hole 11 of the ferrule 3A, at least 1 of the guide pins 12 is required.
It is necessary to insert mm into the guide hole 11 for alignment. At this time, it is necessary to secure the opening diameter R of the guide hole 11 described above. Therefore, it is preferable that the chamfer angle θ of the chamfered portion 13 be within the above range.

By the way, the guide hole formed in the ferrule may contract and slightly curve under the influence of the molding of the ferrule. At this time, if the diameter of the guide hole is constant overall, the guide hole is formed when the guide pin is inserted into the guide hole of the ferrule from the front end face side to manufacture an optical connector with a guide pin, for example. The rear end (base end) of the guide pin interferes with the inner wall surface of the ferrule, and the guide pin may not be accurately positioned depending on the contact position. Further, if the guide pin is shortened in order to avoid such a problem, the portion of the guide pin inserted into the guide hole is shortened accordingly, and the guide pin may become unstable.

On the other hand, the guide holes 11 of the ferrules 3A and 3B have a first hole portion 11a having a diameter substantially equal to that of the guide pin 12 and the rear end surfaces of the ferrules 3A and 3B more than the first hole portion 11a. The second hole portion 11b is formed on the side and has a diameter slightly larger than that of the first hole portion 11a. As a result, even if the guide hole 11 contracts, for example, the ferrule 3B should be manufactured to manufacture the optical connector 1B.
When the guide pin 12 is inserted into the guide hole 11 from the front end face 6 side, the rear end of the guide pin 12 is prevented from hitting the inner wall surface of the ferrule 3B forming the guide hole 11 (see FIG. 7). At this time, since the bending degree of the guide hole 11 due to the contraction at the time of molding is considered to be about 2 to 3 μm, if the hole diameter of the second hole portion 11b is made larger than the hole diameter of the first hole portion 11a by 5 μm or more. The interference of the guide pins 12 can be surely avoided. Therefore, the guide pin 1
It becomes possible to position the guide pin 12 accurately while stably holding 2 only at the portion of the first hole 11a of the ferrule 3B.

The ferrules 3A and 3B thus configured
In the above, since the chamfered portion 13 is provided at the opening edge portion on the front end face 6 side that forms a part of the guide hole 11, the optical connector 1
When connecting A and 1B, the guide pin 12 fixed to the ferrule 3B is connected to the guide hole 11 of the ferrule 3A.
It is easy to insert it in.

However, if the particle diameter of the filler (the above-mentioned silica) contained in the ferrules 3A and 3B is large, the surface of the chamfered portion 13 does not depend on the method of forming the chamfered portion 13 (additional processing such as molding or drilling). Becomes rough, and when the guide pin 12 hits the chamfered portion 13, the surface of the chamfered portion 13 is chipped or swelled easily. If the chamfered portion 13 is chipped or raised, it becomes difficult to accurately position the guide pin 12 in the guide hole 11.
Further, when the guide pin 12 hits the chamfered portion 13, abrasion powder, dust, or the like is generated, which not only causes damage to the chamfered portion 13, but also adheres to the end face of the optical fiber, which may damage the optical fiber. is there. Furthermore, the optical connectors 1A and 1B
When connecting the PCs (Physical Contact) to each other, the PC connection may be disconnected due to the bulge of the chamfered portion 13. The above-mentioned problems result in an increase in optical connection loss when the optical connectors 1A and 1B are connected to each other.

Therefore, in this embodiment, the ferrule 3A,
The average particle size of the filler contained in 3B is 20 μm or less. The maximum particle size of the filler at this time is preferably 4
It is set to 0 μm or less. As a result, the entire surface of the chamfered portion 13 becomes relatively smooth. At this time, the surface roughness Ra of the chamfered portion 13 is preferably 0.01 to 2.0 μm. The surface roughness referred to here is the average roughness of the center line defined by JIS and the like. Specifically, a roughness curve is obtained and folded back from the center line, and It shows a value obtained by dividing the area by the measurement length. As a result, when the guide pin 12 fixed to the ferrule 3B is inserted into the guide hole 11 of the ferrule 3A, chipping or swelling of the surface of the chamfered portion 13 caused by the guide pin 12 hitting the chamfered portion 13 is suppressed, so that the guide The pin 12 can be accurately positioned in the guide hole 11. Further, since the generation of abrasion powder and the like due to the friction between the guide pin 12 and the chamfered portion 13 is reduced, damage to the optical fiber can be suppressed. Therefore, the optical connectors 1A, 1
The optical connection loss when Bs are connected to each other is reduced, and as a result, stable attachment / detachment characteristics of the optical connectors 1A and 1B can be obtained.

Further, by reducing the particle size of the filler, the moldability of the chamfered portion 13 at the time of molding is improved, and in forming the chamfered portion 13 by additional machining (drilling), wear of the drill It is effective in reducing the amount,
The durability of the drill is improved.

Experimental data relating to optical connection loss when optical connectors are connected to each other are shown in FIGS.

FIG. 8 is experimental data showing optical connection loss when a ferrule having no chamfered portion at the opening edge portion forming a part of the guide hole is used. The filler contained in this ferrule is silica having an average particle size of 20 μm or less. In the figure, the horizontal axis indicates the number of times the optical connector is attached and detached, and the vertical axis indicates the loss increase amount. As can be seen from FIG. 8, the loss increase amount may suddenly increase regardless of the number of times the optical connector is attached / detached, and the attachment / detachment characteristics of the optical connector are unstable.

FIG. 9 is experimental data showing the optical connection loss when the ferrule of this embodiment, that is, the ferrule having the chamfered portion provided at the opening edge portion forming a part of the guide hole is used. The filler contained in this ferrule is silica having an average particle size of 20 μm or less. In this case, the amount of increase in loss is small regardless of the number of times the optical connector is attached / detached, and the attachment / detachment characteristics of the optical connector are stable.

From the experimental data of FIGS. 8 and 9, not only the particle size of the filler contained in the ferrules 3A and 3B is reduced, but also the front end face 6 side forming a part of the guide hole 11 of the ferrules 3A and 3B is formed. It can be seen that the connection loss between the optical fibers can be effectively improved by providing the chamfered portion 13 at the opening edge portion.

FIG. 10 is an experiment showing the optical connection loss when the particle diameter of the filler (silica) contained in the ferrule is changed in the ferrule having the chamfered portion at the opening edge forming a part of the guide hole. The data. In the figure,
The horizontal axis indicates the average particle size of the filler, and the vertical axis indicates 0.3d.
The occurrence rate of loss increase amount of B or more is shown. This FIG.
As can be seen from the above, when the average particle size of the filler is 20 μm or less, the occurrence rate of the loss increase amount of 0.3 dB or more is 0.
Has become. From this, the average particle size of the filler is 2
It can be seen that it is effective to set it to 0 μm or less.

FIG. 11 is experimental data showing optical connection loss when the surface roughness Ra of the chamfered portion is changed in the ferrule having the chamfered portion at the opening edge portion forming a part of the guide hole. In the figure, the horizontal axis represents the surface roughness Ra of the chamfered portion, and the vertical axis represents the initial optical connection loss.
As can be seen from FIG. 11, the surface roughness Ra of the chamfered portion is
Is less than 2 μm, the initial loss is relatively stable around 0.15 dB.

FIG. 12 is experimental data showing optical connection loss when the surface roughness Ra of the chamfered portion is changed in the ferrule having the chamfered portion at the opening edge portion forming a part of the guide hole. In the figure, the horizontal axis represents the surface roughness Ra of the chamfered portion, and the vertical axis represents the occurrence rate of the loss increase amount of 0.3 dB or more. As can be seen from FIG. 12, when the surface roughness Ra of the chamfered portion is 2 μm or less, 0.3 d
The occurrence rate of the loss increase amount of B or more is 0.

From the experimental data of FIGS. 11 and 12, when the chamfered portion 13 is provided at the opening edge portion forming part of the guide hole 11 of the ferrules 3A and 3B, the surface roughness Ra of the chamfered portion 13 is 2 μm. Ferrule 3A as below,
It can be seen that it is desirable to form 3B.

The optical connectors 1A, 1 having the above-mentioned structure
B, the guide pin 1 fixed to the ferrule 3B
A rounded curved surface portion 14 is provided at the tip of 2 (see FIGS. 6 and 7). Here, the guide pin 12
Considering that the diameter of the
The length D from the base portion 14a of No. 4 to the tip 12a of the guide pin 12 is preferably 0.1 to 0.35 mm. By forming the curved surface portion 14 at the tip of the guide pin 12 as described above, when the guide pin 12 fixed to the ferrule 3B is inserted into the guide hole 11 of the ferrule 3A, the guide pin 12 and the chamfered portion 13 are worn by contact. Generation of powder etc. is further reduced. Therefore, more stable optical connection characteristics can be obtained.

The present invention is not limited to the above embodiment. For example, although the optical connector of the above embodiment is an MPO connector, the present invention is not particularly limited to this and can be applied to an MT connector and the like.

Further, in the above embodiment, the optical connector with the guide pin and the optical connector without the guide pin are coupled, but the present invention is not particularly limited to this, and the optical connector without the guide pin. It can also be applied to a type in which two guide pins are connected to each other. In this case, as shown in FIG. 13, it is preferable to provide curved end portions 16 that have been subjected to a rounding process in the same manner as the above-described guide pin 12 at both ends of the guide pin 15.

Further, in the above embodiment, the ferrule 3
Although silica was used as the filler (filler) to be filled in the resin for forming A and 3B, the filler is not particularly limited to silica.

[0046]

According to the present invention, the average particle size of the filler contained in the ferrule is 20 μm or less, and the chamfered portion is provided at the opening edge portion on the connection end face side forming a part of the guide hole. Not only can the guide pin be easily inserted into the guide hole when the connector is connected, but damage such as chipping and swelling that may occur on the surface of the chamfer can be reduced. As a result, the optical connection loss at the time of connector connection is reduced, and the attachment / detachment characteristics of the optical connector are improved.

[Brief description of drawings]

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

FIG. 2 is a plan view of a ferrule of the optical connector without guide pins shown in FIG.

FIG. 3 is a front view of the ferrule shown in FIG.

4 is a sectional view taken along line IV-IV in FIG.

5 is a sectional view taken along line VV of FIG.

FIG. 6 is a plan view of a ferrule of the optical connector with guide pins shown in FIG.

7 is a sectional view taken along line VII-VII in FIG.

FIG. 8 is experimental data showing an optical connection loss when an optical connector having a ferrule in which a chamfered portion is not provided at an opening edge portion forming a part of a guide hole is used.

FIG. 9 is experimental data showing optical connection loss when the optical connector shown in FIG. 1 is used.

FIG. 10 shows the optical connection loss when the particle diameter of the filler contained in the ferrule is changed in the case of using an optical connector having a ferrule having a chamfered portion at the opening edge portion forming a part of the guide hole. It is the experimental data shown.

FIG. 11 shows optical connection loss when the surface roughness of the chamfered portion is changed when an optical connector having a ferrule having a chamfered portion provided at an opening edge portion forming a part of a guide hole is used. These are experimental data.

FIG. 12 shows the optical connection loss when the surface roughness of the chamfered portion is changed in the case of using an optical connector having a ferrule in which a chamfered portion is provided at the opening edge portion forming a part of the guide hole. These are experimental data.

13 is a diagram showing an example of guide pins used to connect the optical connectors without guide pins shown in FIG.

[Explanation of symbols]

1A, 1B ... Optical connector, 3A, 3B ... Ferrule, 4
A, 4B ... Optical fiber tape core wire, 6 ... Front end face (connection end face), 7 ... Optical fiber positioning hole, 11 ... Guide hole, 1
1a ... 1st hole part, 11b ... 2nd hole part, 12 ... Guide pin, 13 ... Chamfer part, 14 ... Curved part, 15 ... Guide pin, 16 ... Curved part.

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tomohiko Ueda 1 Taya-cho, Sakae-ku, Yokohama-shi, Kanagawa Sumitomo Electric Industries, Ltd. Yokohama Works (72) Toshiaki Kakii 1 Taya-cho, Sakae-ku, Yokohama, Kanagawa Sumitomo Electric Industries Yokohama Works Co., Ltd. (56) Reference JP-A-10-186175 (JP, A) JP-A-10-48468 (JP, A) JP-A-9-108954 (JP, A) JP-A-8-234056 ( JP, A) JP-A-4-298704 (JP, A) International Publication 99/054770 (WO, A1) (58) Fields investigated (Int.Cl. ⁷ , DB name) G02B 6/38

Claims (7)

(57) [Claims] 1. An optical fiber extending inward from a connection end face.
Guide for inserting fiber positioning holes and a pair of guide pins
In an optical connector provided with a ferrule having a hole, The ferrule isThe average particle size is 20 μm or less, and
Silica with a maximum particle size of 40 μm or less is poniphenylene
Formed by adding to sulfide
Yes, Opening edge on the side of the connection end face forming a part of the guide hole
In the departmentSurface roughness of 0.01 to 2.0 μmChamfer
An optical connector that is provided. 2. The opening diameter of the guide hole at the connection end surface is 1.0 to 1.5 mm when the connection end surface is obliquely polished at an angle of 8 degrees. 1 Symbol mounting of the optical connector according to claim. 3. The chamfer angle of the chamfer is 90 to 15.
The optical connector of claim 1, wherein a is 0 degrees. 4. The guide hole is formed on a first hole portion having a diameter substantially equal to that of the guide pin and on a side opposite to the connection end face side of the first hole portion, and the first hole portion is formed. And a second hole portion having a diameter larger than that of the first hole.
The optical connector according to claim 3 . 5. An optical fiber extending inward from the connection end face.
Fel having fiber positioning holes and a pair of guide holes
And a pair of guide pins inserted into the guide holes.
In an optical connector equipped with The ferrule isThe average particle size is 20 μm or less, and
Silica with a maximum particle size of 40 μm or less is poniphenylene
Formed by adding to sulfide
Yes, Opening edge on the side of the connection end face forming a part of the guide hole
In the departmentSurface roughness of 0.01 to 2.0 μmChamfer
R guide is provided on the end of the guide pin.
Optical connector characterized by being provided with a curved surface part
Kuta. 6. The light according to claim 5 , wherein the guide pin is fixed to the ferrule in a state that the guide pin is inserted into the guide hole such that a front end side of the guide pin projects a predetermined length from the connecting end surface. connector. 7. The guide pin has a diameter of approximately 0.7 mm, and a length from a base portion of the curved surface portion to a tip of the guide pin is 0.1 to 0.35 mm. The optical connector according to 5 or 6 .