WO2014036781A1

WO2014036781A1 - Optical fiber access plug with one-piece housing

Info

Publication number: WO2014036781A1
Application number: PCT/CN2012/083399
Authority: WO
Inventors: 杨国; 陈林; 王七月
Original assignee: 深圳日海通讯技术股份有限公司
Priority date: 2012-09-06
Filing date: 2012-10-24
Publication date: 2014-03-13
Also published as: CN102854579B; CN102854579A

Abstract

An optical fiber access plug with a one-piece housing comprises the housing (1), a ferrule component (2) connected to an optical fiber (8), and a tail sheath (3). The ferrule component (2) comprises a ceramic ferrule (21) and a ceramic ferrule tail seat (22) fixed with the ceramic ferrule (21). The housing (1) is in a one-piece cavity structure. A front end of the housing (1) is provided with a through hole (11), and a tail portion of the housing is inserted into a tail pipe (4). The ceramic ferrule (21) penetrates through the through hole (11). A front portion of the tail pipe (4) is in interference connection with an inner wall of the housing (1) through a backstop barb (41) on an outer wall of the tail pipe, and a rear portion of the tail pipe (4) is connected to the tail sheath (3). The housing (1) cavity between the ceramic ferrule tail seat (22) and the tail pipe (4) is provided with a spring (5) for providing a fitting force for abut joint of the plug.

Description

Description Fiber optic access plug with integral housing

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fiber optic connection device, and more particularly to a fiber optic access plug having an integral housing. BACKGROUND OF THE INVENTION Optical fiber communication has become one of the main pillars of modern communication, and plays a pivotal role in modern telecommunication networks. The development of network technology has made optical fiber widely used as a transmission medium for high-speed and broadband data communication. A fiber optic connector is a detachable (active) connection between an optical fiber and an optical fiber that precisely interfaces the two end faces of the optical fiber such that the optical energy output from the transmitting optical fiber is maximally coupled to the receiving optical fiber. And minimize the impact on the system due to its involvement in the optical link. At present, the commonly used fiber optic connectors can be divided into various forms according to the structure of the connector: FC, SC, ST, LC, D4, DIN, MU, MT, and the like.

The FC type fiber optic connector was first developed by NTT Japan. The external reinforcement method is a metal sleeve and the fastening method is a turnbuckle.

The SC type fiber optic connector has a rectangular outer casing, and the pin and the coupling sleeve are of the same structural size as the FC type, and the fastening method is a plug-and-pin type.

The difference between the ST connector and the SC type fiber connector is that the core of the ST connector is exposed, and the core of the SC connector is inside the connector.

The LC connector was developed by the famous Bell Institute and is made with a convenient modular jack (RJ) latching mechanism. The size of the pins and sleeves used is half that of ordinary SC, FC, etc., which is 1.25 匪, and the corresponding interface end face size is 4. 5匪X 4. 5匪, which can improve the fiber wiring. The density of the fiber optic connectors in the rack. At present, in the single-mode SFF, LC type connectors have actually occupied a dominant position, and the application in multi-mode has also grown rapidly. The MU (Miniature Unit Coupling) connector is the world's smallest single-core fiber optic connector developed by NTT based on the most widely used SC-type connector. 5毫米 X 4. 4毫米。 The connector with a 1. 25mm diameter of the aluminum tube and self-retaining mechanism, the advantage is that it can achieve a high-density installation, but the interface end face size still reached 6. 5mm X 4. 4mm.

With the large-scale advancement of FTTH (Fiber To The Home), the optical fiber network is rapidly developing in the direction of larger bandwidth and larger capacity, and the number of optical fiber handovers in the optical access network is increasing. The demand for the transfer capacity of the device is also increasing. The installation density of the fiber connector is required to be higher and higher, and the corresponding volume is getting smaller and smaller. In particular, the lateral dimension of the end face of the fiber connector interface is required to be as small as possible to achieve On the basis of the constant physical volume of the existing equipment, the installation density of the optical fiber connector is increased, but the structure and assembly process of the above existing optical fiber connector are not suitable for such a demand.

At the same time, the outer casing of the existing optical fiber connector is generally divided into two parts. For example, the SC is divided into inner and outer frame sleeves, and the LC is divided into front and rear casings. The process of manufacturing the two-part structure is complicated, and the process required for installation is required. It is also complicated, and the two-part fiber optic connector housings are usually fixedly connected by snaps. Multiple plugging and unplugging may cause the connection strength to be lowered, which is a weak connection between the two, affecting the product. In normal use, only new products can be replaced, which increases waste of manufacturing and use costs.

Summary of the invention

The object of the present invention is to provide an optical fiber access plug having an integral casing, and the outer casing of the optical fiber access plug adopts an integral design, which is different from the existing optical fiber connector structure, and can be greatly reduced under the premise of satisfying the structural strength. The lateral dimension of the end face of the fiber optic connector increases the mounting density of the fiber optic connector, and at the same time makes the structure of the fiber access plug more compact, quicker and more convenient to install and manufacture.

To this end, the present invention employs the following technical solutions:

A fiber optic access plug having an integral housing, comprising a housing and a ferrule assembly connected to the optical fiber And a ferrule assembly, the ferrule assembly includes a ceramic ferrule and a ceramic ferrule tailstock fixed to the ceramic ferrule, wherein the housing is an integrated cavity structure, and the front end of the housing is provided with a through hole a hole, a tail portion is inserted into the tail pipe, the ceramic ferrule is pierced from the through hole, and the front portion of the tail pipe is connected to the inner wall of the casing through the anti-back barb on the outer wall thereof, and the rear portion of the tail pipe is connected with the tail sheath; A housing cavity between the ceramic ferrule tailstock and the tail pipe is provided with a spring to provide a fitting force when the plug is docked.

Further, the tail pipe has a circular through hole that is open to the cavity of the casing.

Further, the housing is provided with a resilient cantilever for locking with the insertion portion, the fixed end of the elastic cantilever is facing the tail of the connector, and the free end is facing the insertion end and is provided with a retaining projection.

Further, the inner wall of the through hole is provided with a plurality of symmetrically arranged positioning protrusions; the ceramic ferrule tailstock is provided with a positioning groove matched with the positioning protrusion.

Further, the anti-back barbs on the tail pipe are arranged in an annular shape and are flattened on both sides.

Further, the tail sheath is fixedly connected to the plug through a tail pipe, the tail sheath is an elastic rubber or plastic material, and a fastening sleeve is sequentially arranged from the inside to the outside of the tail sheath and the tail pipe. And heat shrink tubing is used to fix the fiber to the tail pipe.

Preferably, the lateral width of the housing is 2. 5 mm to 4. 5 mm.

Preferably, the tail pipe is processed from copper or aluminum.

The invention has the following beneficial effects: The invention provides a light-access plug with an integral casing and a assembling method thereof, and the outer casing adopts an integrated cavity structure, which is integrally compression-molded by a mold, which is generally composed of two The partially-assembled outer casing has a simpler structure and is more convenient and quicker in the production and assembly process, and can avoid the use of the two-part structure in the process of plugging and unplugging, which causes the connection strength between the components to be reduced and cannot be used; The spring in the invention is disposed in the cavity of the outer casing, and the spring is guided by the cavity of the connector outer casing, and the two ends thereof are respectively limited by the ceramic ferrule tailstock and the tail pipe, and no additional structure is needed for fixing, and can be provided Sufficient fit. DRAWINGS

The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

1 is a schematic view showing an assembly structure of an optical fiber access plug provided by an embodiment;

2 is a schematic external structural view of an optical fiber access plug provided by an embodiment;

Figure 3 is an exploded view of the Figure 2;

4 is a schematic structural view of an optical fiber access plug housing according to an embodiment;

Figure 5 is a schematic structural view of the ferrule assembly of the embodiment;

Fig. 6 is a schematic structural view of a tail pipe according to an embodiment.

among them:

1: housing; 2: ferrule assembly; 3: tail sheath; 4: tail tube; 5: spring; 6: fastening sleeve; 7: heat shrink tube;

11: through hole; 12: elastic cantilever; 13: annular groove; 21: ceramic ferrule; 22: ceramic ferrule tailstock; 41: stop barb;

111: positioning protrusion; 121: fixed end; 122: free end; 221: positioning groove;

1221: Retreating the bump;

detailed description

As shown in FIGS. 1 to 6, a specific embodiment of a light access plug having an integral housing according to the present invention is provided, which comprises a housing 1, a ferrule assembly 2 connected to the optical fiber, and a tail sheath 3, The ferrule assembly 2 includes a ceramic ferrule 21 and a ceramic ferrule tailstock 22 fixed to the ceramic ferrule; the housing 1 is an integrated cavity structure, the front end of the housing 1 is provided with a through hole 11, and the tail is inserted into the tail tube 4 The ceramic ferrule 21 passes through the through hole 11; the front portion of the tail pipe 4 is connected to the inner wall of the casing 1 through the anti-back barbs 41 on the outer wall thereof, and the tail pipe 4 is connected to the tail casing 3 at the rear, and the tail pipe 4 has a circular through hole which is open to the cavity of the casing; the casing inner cavity between the ceramic ferrule tailstock 22 and the tail pipe 4 is provided with a spring 5 for providing a fitting force when the plug is butted. The housing 1 is provided with an elastic cantilever 12 for locking with the insertion portion. The fixed end 121 of the elastic cantilever 12 faces the tail of the connector, and the free end 122 faces the insertion end and is provided with the retracting projection 1221; The end of the elastic cantilever 12 has a beveled retracting projection 1221. The anti-retracting projection 1221 can be inserted from the corresponding adapter under the elastic force of the elastic cantilever 12 when the optical fiber connector is inserted into a design position such as an adapter module. The groove is ejected to form a lock; when exiting, the lower arm is pressed accordingly, and the retracting projection 1221 is withdrawn from the groove on the adapter, and the bevel structure is automatically driven from the adapter slot by the elastic force of the elastic cantilever 12 itself. The fixed end 121 of the elastic cantilever 12 is located at the rear end of the connector housing 1 and has a free end 122 facing the connector insertion end. During the exit process, the pulling of the adjacent fiber is not formed, thereby effectively avoiding misoperation and adjacent fibers. At the same time, it can be easily inserted from the free end by means of a lasso and the like, thereby pulling out the connector, effectively solving the high-density connection. Inconvenient to pull out of ills.

The inner wall of the through hole 11 is provided with a plurality of symmetrically arranged positioning protrusions 111. At the same time, the ceramic ferrule tailstock 22 is provided with a positioning groove 221 which cooperates with the positioning protrusion, and the positioning protrusion 111 and the positioning groove 221 cooperate with each other. To limit the rotation of the ceramic ferrule assembly 2, and to guide the axial movement of the ceramic ferrule assembly 2.

The housing 1 of the light access plug adopts an integrated cavity structure, and the outer casing 1 is integrally formed by a mold, and has a simple structure compared with the existing outer casing which is generally composed of two parts, and is convenient in production and assembly. Quick and easy, it can avoid the connection strength between the two parts caused by the mutual insertion and removal of the two parts, and the connector can not be used.

The circular through hole of the tail pipe 4 and the cavity of the casing 1 serves as a fiber passage on the one hand, and has a larger inner diameter on the other hand, and can serve as a curved accommodation space when the optical fiber is retracted when the plug is docked. The tail pipe 4 is made of copper or aluminum. The copper or aluminum material can increase the structural strength of the tail pipe 4, and at the same time facilitate the processing of the tail pipe; the tail pipe 4 has a check barb 41, which is The unwinding hook 41 is in a ring shape Distributing, and performing flattening treatment on both sides thereof, and at the same time, an annular groove 13 matching the retaining barb 41 is disposed on the outer casing 1, and the interference fit between the anti-back barb 41 and the annular groove 13 enables The tail pipe 4 and the outer casing 1 are fixedly connected; the two sides of the anti-back barbs 41 are flattened, and the lateral width of the outer casing 1 can be further reduced while preventing the rotation of the tail pipe 4, and the lateral width of the outer casing 1 can be realized. 2. 5mm to 4. 5mm, the access plug of the present invention has a smaller width than the existing connector, and the mounting density of the fiber access plug can be greatly improved.

a spring 5 disposed between the ceramic ferrule tailstock 22 and the tail pipe 4, the spring 5 being compressed between the ceramic ferrule tailstock 22 and the tail pipe 4, one end of which is sleeved on the ceramic ferrule 22, and the other end The sleeve is connected to the tail pipe 4 and is compressed and fixed by the tail pipe 4. After the ceramic ferrule 21 is mated with the adapter, the spring 5 provides the ceramic ferrule 21 with the bonding force when the butt joint is mated, and the ceramic ferrule 21 is realized. The elastic butt joint can make the ceramic ferrule 21 and the adapter fit more closely; and the cavity of the outer casing 1 forms a circumferential constraint on the spring 5, and the ceramic ferrule tailstock 22 and the tail pipe 4 provide a limit, which does not need In addition, other structures are added to provide the limit and fixing of the spring 5.

In order to protect the optical fiber, the optical fiber access plug further has a tail sheath 3, and the tail sheath 3 is fixedly connected to the plug through the tail pipe 4, which is an elastic rubber or material material, and is a thick and thin cone a structure; a fastening sleeve 6 and a heat shrink tube 7 are arranged between the tail sheath 3 and the tail pipe 4 in order from the inside to the outside for fixing the optical fiber in the tail pipe 4, wherein the heat shrinkable tube 7 is disposed in the tail sheath 3 inside.

The above provides the structural composition of the integrated casing optical fiber access plug according to the present invention, and corresponding to the optical fiber access plug, the corresponding assembly method includes the following steps:

Step A: First insert the end of the ceramic ferrule into the ceramic ferrule tailstock to fix it;

Step B: sequentially insert the fiber access end into the tail sheath, the fastening sleeve, the tail pipe, and the spring;

Step C: Remove the fiber of the access end, retain the appropriate length of the fiber tight sleeve, the spun layer and expose the fiber core of the appropriate length, clean the core of the fiber to remove the coating on the surface of the core, and pass through the ceramic ferrule Tailstock Inserted into a ceramic ferrule with a fixed glue;

Step D: heating and fixing the fixing glue previously dropped into the ceramic ferrule, and fixing the optical fiber to the ceramic ferrule;

Step E: After the fixing glue is fixed, the ceramic ferrule and the ceramic ferrule tailstock are placed into the casing, and the spring is inserted into the casing and inserted into the casing to make the spring between the ceramic ferrule tailstock and the tail pipe. And in a compressed state, the front portion of the tail pipe is connected to the inner wall of the casing through an anti-back barb on the outer wall thereof;

Step F: sleeve the spun layer on the tail pipe, and put on the fastening sleeve, and press and deform the fastening sleeve to form a fixed connection with the tail pipe;

Step G: Insert the tail sheath and the clamping sleeve together to complete the assembly of the fiber access plug.

In order to further enhance the connection strength between the fiber and the fiber access plug, the step G further includes: bonding the fiber skin and the tail sheath together by glue.

Under the premise that the lateral dimension of the casing is large and the thickness of the tail sheath is sufficiently large, the heat shrinkable sleeve can be further used to increase the connection strength of the optical fiber, and correspondingly penetrate the heat shrink sleeve before entering the fastening sleeve in step B. After the step F is completed, the heat shrinkable sleeve is sleeved on the outside of the fastening sleeve and the outer skin of the optical fiber, and the heat shrinkable sleeve is heat-shrinked and fixed.

The above description is intended to be a detailed description of the possible embodiments of the present invention, and the embodiments are not intended to limit the scope of the invention, and the equivalents or modifications which are made without departing from the technical spirit of the present invention should be included in The scope of the patent claimed in this application.

Claims

claims

1. An optical fiber access plug with an integrated shell, including a shell, a ferrule assembly connected to an optical fiber, and a tail sheath. The ferrule assembly includes a ceramic ferrule and a ceramic ferrule fixed to the ceramic ferrule. Core tailstock, characterized in that the housing is an integrated cavity structure, the front end of the housing is provided with a through hole, the tail is inserted into the tail tube, the ceramic ferrule passes through the through hole, and the front end of the tail tube The back end of the tail tube is interference-connected to the inner wall of the housing through the stop barb on its outer wall, and the rear part of the tail tube is connected to the tail sheath; a spring is provided in the inner cavity of the housing between the ceramic ferrule tail seat and the tail tube to provide plug docking time fit.

2. The optical fiber access plug according to claim 1, characterized in that the tail pipe has a circular through hole that is directly connected to the cavity of the housing.

3. The optical fiber access plug according to claim 1, characterized in that, the housing is provided with an elastic cantilever for locking with the insertion point, the fixed end of the elastic cantilever is facing the tail of the connector, and the free end is facing The insertion end is provided with a back-stop bump.

4. The optical fiber access plug according to claim 1, characterized in that, the inner wall of the through hole is provided with a plurality of symmetrically arranged positioning protrusions; and the ceramic ferrule tailstock is provided with a plurality of positioning protrusions corresponding to the positioning protrusions. Matching positioning grooves.

5. The optical fiber access plug according to claim 1, characterized in that the stop barbs on the tail tube are arranged in a ring shape and are flattened on both sides.

6. The optical fiber access plug according to claim 1, characterized in that, the tail sheath is fixedly connected to the plug through a tail tube, the tail sheath is made of elastic rubber or plastic material, and the tail sheath is made of elastic rubber or plastic material. There are fastening sleeves and heat-shrinkable tubes arranged between the fiber optic cable and the tail pipe from the inside to the outside to fix the optical fiber to the tail pipe.

7. The optical fiber access plug according to any one of claims 1 to 6, characterized in that the lateral width of the housing is 2.5mm to 4.5mm.

8. The optical fiber access plug according to any one of claims 1 to 6, characterized in that the tail pipe is made of copper or aluminum.