Optical fiber contact element and optical fiber connector

Abstract

The utility model belongs to the technical field of connectors, and particularly relates to an optical fiber contact element and an optical fiber connector, the optical fiber connector comprises a connector shell and an optical fiber contact element, the optical fiber contact element comprises a contact pin and a flange plate, the rear end of the contact pin is a plug-in mounting end, the plug-in mounting end of the contact pin is forcibly mounted in a mounting hole at the front end of the flange plate, and the flange plate is provided with a through hole. An inner hole used for installing a fiber core in a penetrating mode is formed in the contact pin, the inner hole comprises a first inner hole section located at the front end and a second inner hole section communicated with the rear end of the first inner hole section, the diameter of the second inner hole section is larger than that of the first inner hole section, and the length of the second inner hole section in the front-back direction is larger than or equal to the length of the contact pin matched with the flange plate. When the contact piece of the connector is assembled, a forced installation mode can still be adopted, the fiber core is not interfered to penetrate into the contact pin, the connection strength of the contact pin is ensured, a new process does not need to be added, and the cost is not additionally increased; and when the contact pin and the flange plate are processed, higher precision is not needed, and the production cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of connector, concretely relates to a kind of optical fiber contact and optical fiber connector. BACKGROUND

[0002] The optical fiber contact in prior art usually includes pin, flange plate for fixing pin, and optical fiber, as shown in Figure 1 The pin of existing structure is internally provided with optical fiber hole penetrating the pin, and the optical fiber hole is used to pass the core of optical fiber, and when the pin is inserted into the jack structure, the optical fiber is connected to realize the transmission of optical signal.The pin and flange plate are interference fit to realize the fixation of pin and flange plate when the pin of existing structure is pressed into the flange plate, and the deviation between the diameter of flange plate mounting hole and the diameter of pin outer circle should not be too large, so as to avoid the shrinkage of optical fiber hole of pin under the extrusion of inner wall of flange plate mounting hole, which affects the smooth insertion of core into the optical fiber hole of pin, and even causes the core of optical fiber to be unable to insert into the pin.Therefore, the matching size of flange plate mounting hole and pin outer circle is required to be relatively high, and if the deviation is too large when interference fit, the core of optical fiber is unable to be inserted, and if the deviation is too small when interference fit, the interference amount is insufficient, which causes the pin to be easily separated from flange plate mounting hole, and the processing precision is required to be high, which increases the processing cost.

[0003] In the patent with application number 201921783468.7 and invention name of brazing type ceramic pin assembly structure, the ceramic pin is provided with optical fiber hole for passing the core of optical fiber in the center, the ceramic pin flange is provided with optical fiber channel for passing optical fiber and mounting hole for inserting and mounting ceramic pin in sequence in the front end of optical fiber channel, the mounting hole is communicated with optical fiber hole after the ceramic pin is inserted into the ceramic pin flange;the mounting hole includes strong mounting hole at the rear end of mounting hole for interference fit with ceramic pin and brazing section at the front end of strong mounting hole for brazing fixation with ceramic pin;the diameter of strong mounting hole is slightly smaller than the outer diameter of ceramic pin, the diameter of brazing section is larger than the diameter of strong mounting hole and the outer diameter of ceramic pin, the ceramic pin is strongly mounted into strong mounting hole to form annular space containing filler metal with brazing section, the filler metal is filled and heated to melt, and the brazing fixation is completed after the filler metal is condensed.In the patent, the length of strong mounting hole is minimized to avoid reducing the inner diameter of optical fiber hole of ceramic pin, and further avoid the core to be unable to insert into the ceramic pin, and reduce the influence of strong mounting on optical fiber hole of ceramic pin, but in order to increase the connection strength of flange plate and ceramic pin, brazing section is still needed to be arranged to realize the brazing fixation between ceramic pin and flange plate, which increases the connection strength of ceramic pin and flange plate, but increases the brazing process, and further increases the complexity of process, and improves the production cost. UTILITY MODEL CONTENTS

[0004] To address the technical issues of incompatibility between connection strength, smooth insertion of optical fiber into the ferrule, and production cost during the assembly of the optical fiber contact pin and flange, this utility model provides an optical fiber contact and an optical fiber connector.

[0005] The objective of this utility model is achieved through the following technical solution. According to this utility model, an optical fiber contact includes a ferrule and a flange. The rear end of the ferrule is an insertion end, which is forcibly installed in a mounting hole at the front end of the flange. The ferrule has an inner hole for inserting the fiber core. The inner hole includes a first inner hole segment located at the front end and a second inner hole segment communicating with the rear end of the first inner hole segment. The diameter of the second inner hole segment is larger than the diameter of the first inner hole segment, and the length of the second inner hole segment in the front-rear direction is greater than or equal to the length of the ferrule mating with the flange.

[0006] Compared with the prior art, the advantages of this utility model are:

[0007] This invention adds a second inner hole with a larger diameter inside the pin, which prevents the fiber core from being unable to be inserted into the inner hole of the pin after the pin is forcibly installed. The second inner hole plays a better guiding role, making it easier for the fiber core to pass into the inside of the pin, without changing the original assembly process and avoiding increased costs.

[0008] Furthermore, the second inner hole section is a tapered hole, and the diameter of the tapered hole gradually decreases in the mating direction of the contact members until it is equal to that of the first inner hole section.

[0009] Compared with the prior art, the advantages of this utility model are:

[0010] The tapered hole guides the fiber core through the hole while preventing the deformation of the insertion pin from interfering with the fiber core insertion.

[0011] Furthermore, the second inner hole section is a cylindrical stepped hole with a diameter larger than that of the first inner hole section. A guide hole is formed between the stepped hole and the first inner hole section, with the diameter gradually decreasing to be equal to that of the second inner hole section in the contact insertion direction.

[0012] Compared with the prior art, the advantages of this utility model are:

[0013] The stepped hole has a large diameter, so that the insertion of the fiber core is not affected after the pin is deformed by force. At the same time, the insertion of the fiber core is guided by the guide hole.

[0014] Furthermore, the insertion end of the pin has a guide chamfer.

[0015] Compared with the prior art, the advantages of this utility model are:

[0016] The insertion end of the pin has a guide chamfer to guide the insertion of the pin and the socket.

[0017] Furthermore, the flange has an internal optical fiber channel that communicates with the mounting hole for inserting an optical fiber, located away from the mating end of the contact member. The optical fiber includes an internal fiber core and a tight-fitting layer surrounding the fiber core. The diameter of the optical fiber channel is smaller than the diameter of the mounting hole to form a limiting step between the two.

[0018] Compared with the prior art, the advantages of this utility model are:

[0019] When the pin is forcibly installed into the mounting hole, the limiting step acts as a stop to prevent the pin from being inserted too deeply into the flange, thus avoiding damage to the components.

[0020] Furthermore, the flange has a limiting boss on the outer wall near the mating end of the contact member.

[0021] Compared with the prior art, the advantages of this utility model are:

[0022] The contact is inserted into the contact hole from the front end of the connector housing. The limiting boss abuts against the limiting step in the contact hole to stop it from moving backward. Then, by installing a pressure plate or other structure at the front end of the connector housing, the limiting boss is stopped from moving forward, thereby fixing the contact inside the connector housing.

[0023] Furthermore, the outer wall of the flange away from the contact end of the flange is provided with a crimping structure, which includes axially distributed circumferential bosses and circumferential grooves.

[0024] Compared with the prior art, the advantages of this utility model are:

[0025] After the contact is installed on the connector housing, the crimping structure extends out of the rear end face of the connector housing. A crimping sleeve is fitted onto the rear end of the flange. The crimping sleeve is used to crimp the tensile layer of the optical cable (outer sheath and aramid fiber layer, etc.) between the crimping sleeve and the outer circumferential surface of the rear end of the flange. The tensile layer of the optical cable is fitted onto the crimping structure. Through the crimping structure, the tensile force between the flange and the tensile layer of the optical cable can be increased, preventing the tensile layer from falling off and causing the optical fiber to break.

[0026] An optical fiber connector includes a connector housing and a contact element inserted into the connector housing, wherein the contact element is the optical fiber contact element.

[0027] Compared with the prior art, the advantages of this utility model are:

[0028] The connector contacts can still be assembled using a forced mounting method without interfering with the fiber core passing through the pin, ensuring the connection strength of the pin, without requiring additional processes or increasing costs; and no higher precision is required when processing the pin and flange, reducing production costs.

[0029] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0030] Figure 1 This is a cross-sectional schematic diagram of an optical fiber contact in the prior art;

[0031] Figure 2 This is a cross-sectional schematic diagram of an embodiment of the optical fiber contact of this utility model;

[0032] Figure 3 This is a cross-sectional schematic diagram of an embodiment of the optical fiber contact component of this utility model after the optical fiber is assembled.

[0033] Figure 4 This is a cross-sectional schematic diagram of an embodiment of the optical fiber contact component of this utility model after the optical fiber is assembled.

[0034] [Attached image labels]

[0035] 1-Pin;

[0036] 101-Guide chamfer;

[0037] 102 - First inner hole section;

[0038] 103-Conical hole;

[0039] 104-Step hole;

[0040] 105 - Guide hole;

[0041] 2-Flange;

[0042] 201 - Mounting hole;

[0043] 202 - Fiber Channel;

[0044] 203 - Limiting step;

[0045] 204 - Limiting boss;

[0046] 205 - Press-fit structure;

[0047] 3-Fiber core;

[0048] 4-Tight-fitting layer. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0050] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0051] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0052] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0053] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0054] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0055] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0056] The following detailed description of the features and performance of an optical fiber contact and an optical fiber connector of this application, in conjunction with embodiments, provides further insight into their respective characteristics and performance.

[0057] An embodiment of the optical fiber contact of this utility model is as follows: Figures 2 to 3 As shown, hereinafter referred to as the contact. The description will focus on the mating end of the contact.

[0058] The contact includes a pin 1 and a flange 2. The rear end of the pin 1 is inserted into the front end of the flange 2 to form an optical fiber contact.

[0059] The pin 1 is a cylindrical body with a front end for insertion and a rear end for insertion into the flange 2. The insertion end of the pin 1 is provided with a guide chamfer 101 to guide the insertion of the pin 1 into the socket.

[0060] The insert 1 has an inner hole for installing the fiber core 3. The inner hole includes a first inner hole section 102 located at the front end of the insert 1 and a second inner hole section located at the rear end of the insert 1. The first inner hole section 102 and the second inner hole section are connected to each other.

[0061] The inner hole of the pin 1 extends axially through the entire pin. The first inner hole section matches the diameter of the fiber core 3, achieving accurate positioning of the fiber core 3. After the pin 1 is inserted into the socket, the optical signal is accurately transmitted through the fiber core 3.

[0062] The second inner hole section is a tapered hole 103 corresponding to the insertion end of the pin. The tapered hole 103 is formed by making a long chamfer on the inner hole at the rear end of the pin. The diameter of the tapered hole 103 gradually decreases in the insertion direction of the pin 1 (from back to front) until it is equal to the diameter of the first inner hole section 102. The fiber core 3 can be inserted more quickly through the tapered hole 103.

[0063] The axial (front-back direction) length of the tapered hole 103 is greater than the length of the insertion end of the pin 1. The length of the insertion end is the length of the insertion fit between the pin 1 and the flange 2.

[0064] The flange 2 is a tubular body with a mounting hole 201 at one end. The insertion end of the pin 1 is inserted into the mounting hole 201. The pin 1 and the mounting hole 201 are interference-fitted, which forcibly installs the pin 1 into the mounting hole 201, thereby fixing the pin 1 to the flange 2.

[0065] Because the ferrule 1 and the mounting hole 201 are interference-fitted, the insertion end of the ferrule 1 will shrink slightly during the insertion process, reducing the inner diameter of the corresponding inner hole used for inserting the fiber core. Normally, to ensure that the optical signal transmission does not deviate after the fiber optic connector is inserted, the inner diameter of the ferrule's inner hole is slightly larger than that of the fiber core 3. After the fiber core 3 is inserted into the ferrule's inner hole, it can be limited to prevent the fiber core 3 from swinging within the ferrule's inner hole.

[0066] In the existing technology, after the pin 1 is forcibly installed in the mounting hole 201, even if the inner hole of the pin shrinks slightly, the fiber core 3 will not be able to be smoothly inserted into the inner hole of the pin, resulting in installation failure, scrapping of parts, and increased production costs.

[0067] In this utility model, the inner hole corresponding to the insertion end of the pin 1 is a tapered hole 103. When the pin 1 is forcibly installed in the mounting hole 201, even if the tapered hole 103 shrinks slightly under the force of the forcible installation, since the inner diameter of the tapered hole 103 is much larger than the inner diameter of the first inner hole section 102, it has almost no substantial impact on the inner diameter of the tapered hole 103. This ensures that the fiber core 3 can be smoothly inserted and also plays a guiding role in the insertion of the fiber core 3.

[0068] Furthermore, by using a pin 1 with a tapered hole 103, the pin 1 can still be fixed to the flange 2 using a forced installation process. No additional process or cost is required to ensure that the connection strength between the pin 1 and the flange 2 meets the requirements, while allowing the fiber core 3 to be smoothly inserted into the hole in the pin 1.

[0069] The rear end of flange 2 is a fiber optic channel 202 communicating with mounting hole 201. Fiber optic channel 202 is used to insert optical fibers, which typically include a fiber core 3 and a tight-fitting layer 4 fitted onto the fiber core 3. The tight-fitting layer 4 is stripped from the end of the optical fiber, exposing the fiber core 3. The exposed fiber core 3 is inserted into the hole of ferrule 1, and the fiber core 3 with the tight-fitting layer 4 is inserted into the fiber optic channel 202.

[0070] The inner diameter of the fiber optic channel 202 is smaller than the inner diameter of the mounting hole 201, so that a limiting step 203 is formed between the fiber optic channel 202 and the mounting hole 201. When the ferrule 1 is forcibly installed in the mounting hole 201, the limiting step 203 stops the ferrule 1, preventing the ferrule 1 from being inserted too much into the flange 2 and causing damage to the components.

[0071] The distance between the limiting step 203 and the front end face of the flange 2 is less than the length of the tapered hole 103 inside the pin 1. After the pin 1 is inserted into the mounting hole 201, the shrinkage that occurs at the insertion end only affects the tapered hole 103 and does not affect the diameter of the first inner hole section 102.

[0072] The flange 2 has an annular limiting boss 204 on its outer wall near the mating end. When the contact is inserted into the contact hole from the front end of the connector housing, the limiting boss 204 abuts against the limiting step in the contact hole to stop backward movement. Then, by installing a pressure plate or other structure at the front end of the connector housing, the limiting boss 204 is stopped forward movement, thereby fixing the contact inside the connector housing.

[0073] The outer wall of the rear end of the flange 2 is provided with a crimping structure 205. The crimping structure 205 includes circumferential bosses and circumferential grooves distributed along the axial direction. After the contact is installed on the connector housing, the crimping structure extends out of the rear end face of the connector housing. A crimping sleeve is fitted on the rear end of the flange 2. The crimping sleeve is used to crimp the tensile layer (outer sheath and aramid fiber layer, etc.) of the optical cable between the crimping sleeve and the outer circumferential surface of the rear end of the flange. The tensile layer of the optical cable is fitted on the crimping structure 205. Through the crimping structure 205, the tensile force between the flange 2 and the tensile layer of the optical cable can be increased, avoiding the tensile layer from falling off and causing the optical fiber to break.

[0074] In this embodiment, pin 1 is a ceramic pin.

[0075] A second embodiment of the optical fiber contact of this utility model is as follows: Figure 4 As shown, Embodiment 2 is an improvement on Embodiment 1. The difference between Embodiment 2 and Embodiment 1 is that the inner hole of the insertion end of the pin 1 is a stepped hole 104. The stepped hole 104 is a cylindrical hole with a diameter larger than the diameter of the first inner hole section 102 at the front end of the pin 1.

[0076] The length of the stepped hole 104 is greater than the length of the insertion end of the pin 1. When the insertion end of the pin 1 is inserted into the mounting hole 201, the shrinkage deformation caused by the interference fit between the pin 1 and the mounting hole 201 does not affect the fiber core 3 passing through the stepped hole 104. This allows the fiber core 3 to pass through the stepped hole 104 and the first inner hole section 102 normally.

[0077] A guide hole 105 is formed between the stepped hole 104 and the first inner hole section 102. The diameter of the guide hole 105 gradually decreases in the direction from the stepped hole 104 to the first inner hole section 102. After the fiber core 3 is inserted into the stepped hole 104, since the diameter of the stepped hole 104 is much larger than the diameter of the first inner hole section 102, in order to prevent the fiber core 3 from abutting against the step formed by the stepped hole 104 and the first inner hole section 102, the vertical step is improved into a guide hole 105, which facilitates the smooth insertion of the fiber core 3 into the first inner hole section 102.

[0078] In other embodiments of the optical fiber contact of this utility model, the shape of the inner hole corresponding to the insertion end of the pin 1 is not limited, that is, it is not limited to a tapered hole or a stepped hole, but can also be a second inner hole segment of other shapes. The length of the second inner hole segment can also be equal to the length of the mating between the pin 1 and the flange 2.

[0079] This utility model discloses an embodiment of an optical fiber connector, including a connector housing and a contact element inserted into the connector housing. In this embodiment, the contact element adopts the optical fiber contact element in the above-mentioned optical fiber contact element embodiment one or embodiment two.

[0080] In this embodiment, the second inner hole section inside the rear end of the insert pin 1 is a tapered hole or a stepped hole, and its length is greater than the interference length of the insert pin 1 and the flange 2. This can effectively avoid the situation where the inner hole of the insert pin 1 shrinks after being pressed into the flange 2, causing the fiber core 3 to be unable to pass through the insert pin 1.

[0081] Meanwhile, the hole at the rear end of the insert 1 is set as a tapered hole 103 of a certain length or a stepped hole 104 of a certain length (the stepped hole 104 and the first inner hole section 102 are a guide hole 105), which can effectively guide the insertion of the fiber core 3 and avoid breaking the fiber core 3.

[0082] In summary, this utility model, by adding a tapered hole 103 or a stepped hole 104 inside the insert pin 1, avoids the fiber core 3 being unable to be inserted into the inner hole of the insert pin. The tapered hole 103 or the stepped hole 104 plays a better guiding role, making it easier for the fiber core 3 to pass into the insert pin, without changing the original assembly process and avoiding increased costs.

[0083] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An optical fiber contact comprising a ferrule (1) and a flange (2), the rear end of the ferrule (1) being a mounting end, the mounting end of the ferrule (1) being strongly mounted in a mounting hole (201) in the front end of the flange (2), characterized in that: The pin (1) is provided with an inner hole for passing the fiber core (3), the inner hole includes a first inner hole section at the front end and a second inner hole section communicated with the rear end of the first inner hole section, the diameter of the second inner hole section is larger than that of the first inner hole section, and the length of the second inner hole section in the front-rear direction is greater than or equal to the length of the pin (1) matched with the flange (2).

2. The fiber optic contact of claim 1, wherein: The second inner hole section is a tapered hole (103), and the diameter of the tapered hole (103) gradually decreases to the diameter of the first inner hole section (102) in the contact insertion direction.

3. The fiber optic contact of claim 1, wherein: The second inner hole section is a cylindrical stepped hole (104), the diameter of the stepped hole (104) is greater than that of the first inner hole section (102), and the stepped hole (104) and the first inner hole section (102) form a guide hole (105) gradually decreasing in diameter to the diameter of the first inner hole section (102) in the contact insertion direction.

4. The fiber optic contact of claim 1, wherein: The insertion end of the pin (1) has a guide chamfer (101).

5. The fiber optic contact of claim 1, wherein: The inner part of the flange (2) away from the contact insertion end is provided with a fiber channel (202) communicated with the mounting hole (201) for passing the optical fiber, the optical fiber includes an inner fiber core (3) and a tight sleeve layer (4) sleeved outside the fiber core; the diameter of the fiber channel (202) is smaller than that of the mounting hole (201) to form a limiting step (203) therebetween.

6. The fiber optic contact of claim 1, wherein: The outer wall of the flange (2) close to the contact insertion end is provided with a limiting boss (204).

7. The fiber optic contact of claim 1, wherein: The outer wall of the flange (2) away from the contact insertion end is provided with a crimping structure (205), the crimping structure (205) includes axially distributed annular bosses and annular grooves.

8. An optical fiber connector, characterized by: The connector includes a connector housing and a contact inserted into the connector housing, the contact is the optical fiber contact of any one of claims 1-7.

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