CN105425344A - Fiber terminal and connector - Google Patents

Abstract

The invention provides an optical fiber terminal and a connector. The optical fiber terminal of the connector includes a pin assembly and a lens assembly. The lens assembly includes a sleeve extending forward and backward and a lens fixedly assembled in the sleeve. The pin The assembly includes a pin flange extending forward and backward and a ceramic pin fixedly inserted in the pin flange, and the rear end of the sleeve and the front end of the pin flange are detachably connected by threads. The connector pin assembly and lens assembly of the present invention are detachably connected through the threaded connection of the sleeve and the pin flange, and are very convenient to disassemble. When the optical fiber connected to the pin assembly needs to be replaced, the pin assembly is removed from the After the lens assembly is removed, the optical fiber can be easily taken out from the ferrule assembly, which is convenient for maintenance and greatly reduces the use cost.

Description

An optical fiber terminal and connector

technical field

The invention relates to the field of optics, in particular to an optical fiber terminal and a connector.

Background technique

With the development of information technology, optical fiber connectors have been widely used, and the quality of optical signals transmitted by optical fiber connectors determines the performance of the connectors. For example, the Chinese utility model patent whose authorized announcement number is CN201780391U and whose authorized announcement date is 2010.7.21 discloses an optical fiber beam expansion contact and an optical fiber beam expansion connector using the contact. The contact piece of this connector, that is, the optical fiber terminal, includes a sleeve. The front end of the sleeve is provided with a lens. The lens is bonded in the sleeve to form a lens assembly. The rear end of the sleeve is provided with a ceramic pin. The tubular flange is the pin flange, and the ceramic pin and the tubular flange form the pin assembly. In order to ensure the relative position between the ceramic ferrule and the lens, the ceramic ferrule is generally assembled in the sleeve by bonding or interference fit, which makes the lens assembly and the ferrule assembly non-detachable and fixed together, so it can be used later Sometimes, if the optical fiber connected to the rear end of the ceramic ferrule is bent and damaged or the length of the optical fiber needs to be changed due to changing the applicable occasion, a new contact must be replaced, which is very inconvenient to use, causes serious waste, and increases the cost of use.

Contents of the invention

The object of the present invention is to provide an optical fiber terminal with detachable connection between a ferrule assembly and a lens assembly; at the same time, the present invention also provides a connector using the optical fiber terminal.

In order to solve the above technical problems, the optical fiber terminal of the present invention adopts the following technical solution: an optical fiber terminal, including a pin assembly and a lens assembly, the lens assembly includes a sleeve extending forward and backward and a lens fixedly assembled in the sleeve, so The pin assembly includes a pin flange extending forward and backward and a ceramic pin fixedly inserted in the pin flange, and the rear end of the sleeve and the front end of the pin flange are detachably connected by threads.

The front face of the ceramic contact pin is an optical end face, and the focal point of the lens is located on the optical end face when the sleeve and the contact flange are screwed together.

The sleeve has a protective section extending forward from the front end of the lens to protect the front end face of the lens.

The sleeve is also covered with an alignment sleeve, and the alignment sleeve protrudes forward for a certain length from the front end of the sleeve to form an insertion hole for the insertion of an adapted optical fiber terminal. The alignment sleeve is used to ensure that the optical fiber terminal and The positioning inner peripheral surface coincides with the axis of the sleeve of the optical fiber terminal.

The rear end of the pin flange is covered with an outer sheath, the pin flange and the outer sheath are circumferentially locked, and the inner peripheral surface of the outer sheath is provided with a rearward direction to the pin flange. As for the stopping surface of the stop, the front end of the outer sheath is also provided with a stop member for stopping the pin flange in the forward direction.

The connector of the present invention adopts the following technical solution: a connector including an optical fiber terminal, the optical fiber terminal includes a ferrule assembly and a lens assembly, and the lens assembly includes a sleeve extending forward and backward and a lens fixedly assembled in the sleeve The pin assembly includes a pin flange extending forward and backward and a ceramic pin fixedly inserted in the pin flange, the rear end of the sleeve and the front end of the pin flange are detachably connected by threads.

The front face of the ceramic contact pin is an optical end face, and the focal point of the lens is located on the optical end face when the sleeve and the contact flange are screwed together.

The sleeve has a protective section extending forward from the front end of the lens to protect the front end face of the lens.

The sleeve is also covered with an alignment sleeve, and the alignment sleeve protrudes forward for a certain length from the front end of the sleeve to form an insertion hole for the insertion of an adapted optical fiber terminal. The alignment sleeve is used to ensure that the optical fiber terminal and The positioning inner peripheral surface coincides with the axis of the sleeve of the optical fiber terminal.

The rear end of the pin flange is covered with an outer sheath, the pin flange and the outer sheath are circumferentially locked, and the inner peripheral surface of the outer sheath is provided with a rearward direction to the pin flange. As for the stopping surface of the stop, the front end of the outer sheath is also provided with a stop member for stopping the pin flange in the forward direction.

The connector pin assembly and lens assembly of the present invention are detachably connected through the threaded connection of the sleeve and the pin flange, and are very convenient to disassemble. When the optical fiber connected to the pin assembly needs to be replaced, the pin assembly is removed from the After the lens assembly is removed, the optical fiber can be easily taken out from the ferrule assembly, which is convenient for maintenance and greatly reduces the cost of use.

Further, when the sleeve and the pin flange are screwed tightly, the focus of the lens in the sleeve is just on the optical end surface, which is very convenient during assembly, and the staff only need to tighten the sleeve and the pin flange It can be determined that the optical fiber terminal can achieve good signal transmission when in use.

Further, the sleeve is provided with a protection section at the front end of the lens, which prevents the contact and wear of the end faces of the two lenses when the connector is plugged into the adapter connector, and greatly increases the maximum number of insertions and withdrawals of the connector. The service life of the connector is improved.

Furthermore, by setting the alignment sleeve on the outside of the sleeve, the connector and the matching connector form a structure similar to a pin and a socket, so that when they are inserted into each other, the positioning inner peripheral surface of the alignment sleeve can ensure The axes of the pins in the optical fiber terminals in the two connectors coincide to improve the integrity of signal transmission and ensure the performance of the connectors.

Description of drawings

Fig. 1 is a schematic structural view of Embodiment 1 of the optical fiber terminal of the present invention;

Fig. 2 is a schematic structural diagram of the pin assembly in Fig. 1;

Fig. 3 is a schematic structural view of the lens assembly in Fig. 1;

Fig. 4 is a schematic structural diagram of Embodiment 2 of the optical fiber terminal of the present invention;

FIG. 5 is a schematic structural diagram of the lens assembly in FIG. 4 .

detailed description

Embodiment 1 of the connector of the present invention includes a connector housing and an optical fiber terminal disposed in the connector housing. Figure 1-3 shows the structure of an optical fiber terminal, including a lens assembly and a pin assembly. The lens assembly includes a sleeve 5 extending forward and backward. The inner hole of the sleeve 5 is a stepped hole with a large front and a small rear. The large diameter section at the front end is fixed with a lens 6 , and the small diameter section 54 at the rear end is used for inserting pins. The outer peripheral surface of the rear end of the sleeve 5 is also provided with an external thread 52 for connecting the pin assembly, and the front end of the sleeve 5 exceeds the lens 5 forward, so as to avoid the gap between the two connectors when the connector is docked with the matching connector. The lens is directly contacted to cause wear and tear, which increases the maximum number of plugging and unplugging of the connector and improves the service life.

The pin assembly includes a pin flange 2 extending forward and backward and a ceramic pin 4 fixed in the pin flange 2 , and a through hole extending forward and backward is provided in the middle of the pin flange 2 . The through hole consists of three parts, which are the pin mounting hole located in the middle of the pin flange 2 and the ceramic pin 4 for interference fit, and the pin mounting hole located on the rear side of the pin mounting hole. The optical fiber channel 20 connecting the ceramic ferrule and the connection hole 22 for connecting with the sleeve located on the front side of the ferrule installation hole, the ceramic ferrule 4 protrudes from the front end of the ferrule flange 2 through the connection hole 22 and is used for insertion Inside the small-diameter section 54 at the rear end of the sleeve 5 , the inner peripheral surface of the connecting hole 22 is provided with an internal thread 23 that cooperates with the external thread 52 on the sleeve 5 .

The rear end of the pin flange 2 is also covered with an outer sheath 1, and the pin flange 2 and the outer sheath 1 are circumferentially locked, and the inner peripheral surface of the outer sheath 1 is provided with a mating socket in the backward direction. The pin flange 2 is a stop surface, and the front end of the outer sheath 1 is also provided with a stop member that stops the pin flange 2 in the forward direction. In this embodiment, the inner peripheral surface of the outer sheath 1 is a stepped shape with a large front and a small rear. The rear end of the pin flange 2 is provided with a stop step 21. The stepped surface on the inner peripheral surface of the outer sheath 1 is The stop surface can stop and limit the pin flange 2 in the backward direction. The inner peripheral surface of the outer sheath 1 is also provided with three axially extending guide grooves, and the outer peripheral surface of the pin flange 2 is provided with anti-rotation key blocks 24 corresponding to the guide grooves, and the pin flange 2 and the outer sheath 1. The circumferential anti-rotation is realized through the front and rear guide cooperation of the guide groove and the anti-rotation key block 24. The stopper is a flange plate 3 fixedly assembled on the front end of the outer sheath 1, and the flange plate 3 stops and cooperates with the anti-rotation key block 24 on the pin flange 2 in the forward direction through the inner convex ring at the front end. The forward travel of the pin flange 2 is limited.

Further, in order to ensure that the optical fiber terminal will not be damaged due to over-insertion or vibration and impact during the insertion process, a spring 7 extending forward and backward is also provided between the ferrule flange 2 and the outer sheath 1 . The two ends of the spring 7 respectively act on the stop step 21 and the stepped surface of the inner peripheral surface of the outer sheath 1, which can play a buffering role during insertion so that the pin flange 2 can be adjusted back and forth.

When assembling, set the spring 7 on the rear end of the pin flange 2 and align the anti-rotation key block 24 on the pin flange 2 with the guide groove, insert the pin flange 2 into the outer sheath 1, and then Fit the flange 3 onto the front end of the outer sheath 1, align the ceramic pin 4 with the small diameter section 54 at the rear end of the sleeve 5, and screw the sleeve 5 onto the pin flange 2, and the process is completed Connection of pin components and ceramic components. When the sleeve 5 and the ferrule flange 2 are tightened, the focus of the lens 6 is just located on the front end face of the ceramic ferrule 4. Since the front face of the ceramic ferrule 4 is an optical end face, it is ensured that the optical fiber terminal can achieve good light. Signal transmission. Of course, in other embodiments, the focal point of the lens can be located at the rear side of the optical end face when the sleeve and the pin flange are tightened, and then when the sleeve and the pin flange are tightened, the fixed number of turns can be turned to make the lens The focal point moves to the optical end face.

The second embodiment of the connector of the present invention: as shown in Figure 4-5, mainly provides a connector adapted to the connector of the first embodiment, the difference from the first embodiment is that the connector The structure of the lens assembly. The sleeve 5 of the lens assembly of the connector is also covered with an alignment sleeve 8, and the alignment sleeve 8 protrudes forward for a certain length from the front end of the sleeve 5 to form a hole for the optical fiber terminal of the adapted connector to be inserted into. The insertion hole, the inner peripheral surface of the alignment sleeve 8 is a positioning inner peripheral surface for ensuring that the axes of the optical fiber terminal and the sleeve axis of the optical fiber terminal coincide. When the adapted optical fiber terminal is inserted into the alignment sleeve 8, the front faces of the sleeves of the two optical fiber terminals contact each other, and are kept in contact with each other under the elastic force of the spring on the rear side of the pin flange, and the two optical fibers There is a certain distance between the lenses of the terminals, and there will be no contact wear. The light beam is enlarged by one lens and accepted by the other lens to realize the coupling of the optical signals of the two connectors. In this embodiment, the outer periphery of the sleeve 5 is provided with an eversion edge 50, and the front side of the eversion edge 50 is provided with an external thread segment 51, and the collimating sleeve 8 is connected to the outer periphery of the sleeve 5 through the eversion edge 50, In order to facilitate the insertion of the optical fiber terminal, the front end of the collimation sleeve 8 is also provided with a flared opening 81 that expands gradually from the back to the front.

In the above-mentioned embodiment 1 and embodiment 2, the pin flange and the outer sheath realize the circumferential anti-rotation through the guiding cooperation of the anti-rotation key block and the guide groove. In other embodiments, the circumferential direction can be realized through the form fit stop turning. In the first and second embodiments above, the stop surface on the outer sheath used to stop the pin flange is a stepped surface, and the stopper is the inner convex ring of the flange. In other embodiments Among them, two ring grooves can be set on the inner peripheral surface of the outer sheath, and snap rings are installed in the two ring grooves to stop and limit the pin flange.

The lens assembly and pin assembly of the connector of the present invention are detachably connected, which is very convenient when the optical fiber needs to be replaced, and the maintenance cost is reduced; at the same time, the inner peripheral surface of the collimation sleeve is used to align the two optical fiber terminals, and the structure It is very simple, and also ensures the integrity of optical signal transmission, greatly reducing the loss of optical signals.

The embodiment of the optical fiber terminal of the present invention: as shown in Fig. 1-5, its specific structure is the same as that of the embodiment of the optical fiber terminal in the above-mentioned connector embodiment, and will not be repeated here.

Claims (10)

1. an optic fibre connector, comprise contact pin component and lens subassembly, the sleeve extended before and after described lens subassembly comprises and the lens be fixedly assemblied in sleeve, the contact pin flange extended before and after described contact pin component comprises and the ceramic contact pin be fixedly inserted in contact pin flange, it is characterized in that, the rear end of sleeve and the front end of contact pin flange are by screw thread releasable connection.

2. optic fibre connector according to claim 1, is characterized in that, the front end face of ceramic contact pin is optics end face, and when sleeve and contact pin flange are screwed by screw thread, the focus of lens is positioned on optics end face.

3. optic fibre connector according to claim 1, is characterized in that, sleeve has the protection section extending forward to protect lens front face from the front end of lens.

4. optic fibre connector according to claim 1, it is characterized in that, sleeve is also arranged with aligned sleeves outward, aligned sleeves stretches out forward the front end certain length of sleeve thus forms the spliced eye supplying adapts optical terminal insertion, and aligned sleeves has the location inner peripheral surface that the sleeve axis for ensureing optic fibre connector and adapts optical terminal overlaps.

5. the optic fibre connector according to claim 1-4 any one, it is characterized in that, the rear end of described contact pin flange is arranged with oversheath, contact pin flange and oversheath circumference spline, the inner peripheral surface of oversheath is provided with the stopping surface in a rearward direction contact pin flange being carried out to block, and the front end of oversheath is also provided with the stop part in a forward direction contact pin flange being carried out to block.

6. a connector, comprise optic fibre connector, described optic fibre connector comprises contact pin component and lens subassembly, the sleeve extended before and after described lens subassembly comprises and the lens be fixedly assemblied in sleeve, the contact pin flange extended before and after described contact pin component comprises and the ceramic contact pin be fixedly inserted in contact pin flange, it is characterized in that, the rear end of sleeve and the front end of contact pin flange are by screw thread releasable connection.

7. connector according to claim 6, is characterized in that, the front end face of ceramic contact pin is optics end face, and when sleeve and contact pin flange are screwed by screw thread, the focus of lens is positioned on optics end face.

8. connector according to claim 6, is characterized in that, sleeve has the protection section extending forward to protect lens front face from the front end of lens.

9. connector according to claim 6, it is characterized in that, sleeve is also arranged with aligned sleeves outward, aligned sleeves stretches out forward the front end certain length of sleeve thus forms the spliced eye supplying adapts optical terminal insertion, and aligned sleeves has the location inner peripheral surface that the sleeve axis for ensureing optic fibre connector and adapts optical terminal overlaps.

10. the connector according to claim 6-9 any one, it is characterized in that, the rear end of described contact pin flange is arranged with oversheath, contact pin flange and oversheath circumference spline, the inner peripheral surface of oversheath is provided with the stopping surface in a rearward direction contact pin flange being carried out to block, and the front end of oversheath is also provided with the stop part in a forward direction contact pin flange being carried out to block.