CN213934312U

CN213934312U - Optical network terminal

Info

Publication number: CN213934312U
Application number: CN202120220041.7U
Authority: CN
Inventors: 王超; 洪裕清; 游瑞
Original assignee: Hisense Broadband Multimedia Technology Co Ltd
Current assignee: Hisense Broadband Multimedia Technology Co Ltd
Priority date: 2021-01-26
Filing date: 2021-01-26
Publication date: 2021-08-10
Anticipated expiration: 2031-01-26

Abstract

The application discloses an optical network terminal, which comprises a circuit board, an optical transceiver sub-module and a flexible circuit board, wherein a PCB (printed circuit board) pad and a first positioning hole are arranged on the circuit board; the optical transceiving secondary module is arranged on the circuit board and is electrically connected with the circuit board; one end of the flexible circuit board is electrically connected with the optical transceiver sub-module, the other end of the flexible circuit board is provided with a signal pad corresponding to the PCB pad and a second positioning hole corresponding to the first positioning hole, the second positioning holes are symmetrically arranged on two sides of the flexible circuit board, and the first positioning hole and the second positioning hole are welded in a positioning mode; the signal pad is electrically connected with the PCB pad. The application provides an optical network terminal is applied to the BoB technique, and flexible circuit board's one end is connected with the optical transceiver subassembly electricity, the other end passes through the locating hole and is connected with the circuit board location, and this kind of fixed mode is very big has avoided the too big flexible circuit board fracture that causes of pressure welding pressure, does not need expensive equipment in earlier stage to drop into, very big promotion welded yields and efficiency.

Description

Optical network terminal

Technical Field

The present application relates to the field of optical communications technologies, and in particular, to an optical network terminal.

Background

In the novel business and application modes of cloud computing, mobile internet, video and the like, an optical communication technology is used, and in optical communication, an optical module is a tool for realizing the interconversion of photoelectric signals and is one of key devices in optical communication equipment. The optical module is mainly used for photoelectric and electro-optical conversion, an electric signal is converted into an optical signal by a transmitting end of the optical module and is transmitted out through an optical fiber, and a received optical signal is converted into an electric signal by a receiving end of the optical module.

With the development of the technology, the BOX of the ONT (Optical Network Terminal) is upgraded from the original 1Gbps rate to 10Gbps, and in order to ensure the competitive advantage of the product, the Optical access mode of the BOX of the 10G ONT is developed from an Optical module to a BOSA on Board (BoB) technology, that is, a BOSA (Bi-Directional Optical Sub-Assembly) is directly placed on a circuit Board of the ONT, and the manufacturing link of the Optical module is omitted. Due to the requirement of high speed, the current BoB technology requires the use of a Flexible Printed Circuit (FPC) to connect the BOSA and ONT Circuit boards.

However, the current welding mode of the flexible circuit board and the circuit board comprises traditional pressure welding, automatic mechanical welding and traditional manual welding, the traditional pressure welding is easy to cause the flexible circuit board to break when the pressure welding is too large, the equipment investment in the early stage of the automatic mechanical welding is expensive, and the traditional manual welding has a large requirement on welding personnel, so that the welding yield and efficiency are low.

SUMMERY OF THE UTILITY MODEL

The application provides an optical network terminal to provide a flexible circuit board assembly mode used by a BoB technology, and the yield and efficiency of welding of the flexible circuit board are improved.

In order to solve the technical problem, the embodiment of the application discloses the following technical scheme:

the embodiment of the application discloses an optical network terminal, which comprises:

the circuit board is provided with a PCB bonding pad and a first positioning hole;

the optical transceiving secondary module is arranged on the circuit board and is electrically connected with the circuit board; for transmitting and receiving signal light;

one end of the flexible circuit board is electrically connected with the optical transceiver sub-module, the other end of the flexible circuit board is provided with a signal pad and second positioning holes, the second positioning holes are symmetrically arranged on two sides of the flexible circuit board, the second positioning holes correspond to the first positioning holes, and the first positioning holes are welded with the second positioning holes in a positioning mode; the signal bonding pad corresponds to the PCB bonding pad, and the signal bonding pad is electrically connected with the PCB bonding pad.

The optical network terminal comprises a circuit board, an optical transceiving submodule and a flexible circuit board, wherein a PCB (printed circuit board) pad and a first positioning hole are arranged on the circuit board, and the optical transceiving submodule is arranged on the circuit board and is electrically connected with the circuit board; one end of the flexible circuit board is electrically connected with the optical transceiver sub-module, the other end of the flexible circuit board is provided with a signal pad and second positioning holes, the second positioning holes are symmetrically arranged on two sides of the flexible circuit board, the second positioning holes correspond to the first positioning holes, and the first positioning holes and the second positioning holes are welded in a positioning mode so as to achieve positioning welding of the flexible circuit board and the circuit board; the signal bonding pad corresponds to the PCB bonding pad, and the signal bonding pad is electrically connected with the PCB bonding pad so as to realize the electrical connection of the flexible circuit board and the circuit board. The utility model provides an optical network terminal is applied to the BoB technique, with light transceiver submodule direct mount on the circuit board, receive transceiver submodule and circuit board through flexible circuit board electricity connection, and flexible circuit board welds through the second locating hole that sets up on it and the first locating hole on the circuit board, can realize the location of flexible circuit board and be connected, flexible circuit board is connected through the signal pad that sets up on it and the PCB pad electricity on the circuit board, can realize the electricity of flexible circuit board and be connected. The flexible circuit board in this application passes through the locating hole direct mount on the circuit board, compares in traditional pressure welding, and this kind of fixed mode, the too big flexible circuit board fracture that causes of pressure welding pressure that avoids that can be very big compares in automatic mechanical welding, does not need expensive equipment in earlier stage to drop into, compares in traditional manual welding, and this kind of fixed mode can greatly promote welded yields and efficiency, is a relative economy, efficient production and processing mode.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic diagram of a connection relationship of an optical communication terminal;

fig. 2 is a schematic diagram illustrating an assembly of an optical transceiver sub-assembly and a circuit board in an optical network terminal according to an embodiment of the present disclosure;

fig. 3 is an exploded schematic view of an optical transceiver sub-assembly and a circuit board in an optical network terminal according to an embodiment of the present disclosure;

fig. 4 is an assembly diagram of an optical transceiver sub-assembly, an optical fiber adapter and a flexible circuit board in an optical network terminal according to an embodiment of the present disclosure;

fig. 5 is an exploded schematic view of an optical transceiver sub-assembly and a flexible circuit board in an optical network terminal according to an embodiment of the present disclosure;

fig. 6 is a schematic structural diagram of a flexible circuit board in an optical network terminal according to an embodiment of the present disclosure;

fig. 7 is a schematic partial structure diagram of a circuit board in an optical network terminal according to an embodiment of the present disclosure;

fig. 8 is a schematic diagram of a circuit on a flexible circuit board in an optical network terminal according to an embodiment of the present application;

fig. 9 is a schematic view illustrating an assembly of an optical transceiver sub-assembly, a flexible circuit board and a circuit board in an optical network terminal according to an embodiment of the present disclosure;

fig. 10 is an enlarged view of a portion a in fig. 9.

Detailed Description

In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

One of the core links of optical fiber communication is the interconversion of optical and electrical signals. The optical fiber communication uses optical signals carrying information to transmit in information transmission equipment such as optical fibers/optical waveguides, and the information transmission with low cost and low loss can be realized by using the passive transmission characteristic of light in the optical fibers/optical waveguides; meanwhile, the information processing device such as a computer uses an electric signal, and in order to establish information connection between the information transmission device such as an optical fiber or an optical waveguide and the information processing device such as a computer, it is necessary to perform interconversion between the electric signal and the optical signal.

The optical module realizes the function of interconversion of optical signals and electrical signals in the technical field of optical fiber communication, and the interconversion of the optical signals and the electrical signals is the core function of the optical module. The optical module is electrically connected with an external upper computer through a golden finger on an internal circuit board of the optical module, and the main electrical connection comprises power supply, I2C signals, data information, grounding and the like; the electrical connection mode realized by the gold finger has become the mainstream connection mode of the optical module industry, and on the basis of the mainstream connection mode, the definition of the pin on the gold finger forms various industry protocols/specifications.

Fig. 1 is a schematic diagram of connection relationship of an optical communication terminal. As shown in fig. 1, the connection of the optical communication terminal mainly includes interconnection among the optical network terminal 100, the optical module 200, the optical fiber 101, and the network cable 103.

One end of the optical fiber 101 is connected with a far-end server, one end of the network cable 103 is connected with local information processing equipment, and the connection between the local information processing equipment and the far-end server is completed by the connection between the optical fiber 101 and the network cable 103; and the connection between the optical fiber 101 and the network cable 103 is made by the optical network terminal 100 having the optical module 200.

An optical port of the optical module 200 is externally connected to the optical fiber 101, and establishes a bidirectional photoelectric connection with the optical fiber 101; an electrical port of the optical module 200 is externally connected to the optical network terminal 100, and establishes bidirectional electrical connection with the optical network terminal 100; the optical module realizes the mutual conversion of optical signals and electric signals, thereby realizing the establishment of information connection between the optical fiber and the optical network terminal. Specifically, the optical signal from the optical fiber is converted into an electrical signal by the optical module and then input to the optical network terminal 100, and the electrical signal from the optical network terminal 100 is converted into an optical signal by the optical module and input to the optical fiber.

The optical network terminal is provided with an optical module interface 102, which is used for accessing the optical module 200 and establishing bidirectional electric connection with the optical module 200; the optical network terminal is provided with a network cable interface 104 which is used for accessing the network cable 103 and establishing bidirectional electric connection with the network cable 103; the optical module 200 is connected to the network cable 103 via the optical network terminal 100. Specifically, the optical network terminal transmits a signal from the optical module to the network cable and transmits the signal from the network cable to the optical module, and the optical network terminal serves as an upper computer of the optical module to monitor the operation of the optical module.

At this point, a bidirectional signal transmission channel is established between the remote server and the local information processing device through the optical fiber, the optical module, the optical network terminal and the network cable.

Common information processing apparatuses include routers, switches, electronic computers, and the like; the optical network terminal is an upper computer of the optical module, provides data signals for the optical module, and receives the data signals from the optical module, and the common upper computer of the optical module also comprises an optical line terminal and the like.

The optical network terminal 100 includes a circuit board, a cage is disposed on a surface of the circuit board, the cage is located on the circuit board, and an electrical connector on the circuit board is wrapped in the cage, so that the electrical connector is disposed inside the cage and used for accessing electrical ports such as gold fingers; the cage is provided with a radiator having a first boss portion such as a fin for increasing a heat radiation area.

However, with the development of technology, the ONT BOX is upgraded from the original 1Gbps rate to 10Gbps, and in order to ensure the competitive advantage of products, the optical access mode of the 10G ONT BOX is developed from an optical module to a BOSA on Board (BoB) technology, i.e., the package of the optical module in the optical network terminal is removed, the optical module is directly welded on the circuit Board 105 of the optical network terminal, and the manufacturing link of the optical module is omitted.

Due to the requirement of high speed, the conventional BoB technology needs to use a flexible circuit board to connect the BOSA and the circuit board of the optical network terminal, and the conventional welding mode of the flexible circuit board and the circuit board 105 includes conventional pressure welding, automatic mechanical welding and conventional manual welding.

In order to solve the above problem, this application embodiment provides an optical network terminal, this optical network terminal passes through the locating hole direct mount with flexible circuit board on the circuit board, compare in traditional pressure welding, this kind of fixed mode, the too big flexible circuit board fracture that causes of pressure welding pressure can be greatly avoided, compare in automatic mechanical welding, do not need expensive equipment in earlier stage to drop into, compare in traditional manual welding, welded yields and efficiency can greatly be promoted to this kind of fixed mode, be a relative economy, efficient production and processing mode.

Fig. 2 is an assembly schematic diagram of a circuit board 105 and an optical transceiver sub-assembly 400 in an optical network terminal according to an embodiment of the present disclosure, and fig. 3 is an exploded schematic diagram of the circuit board 105 and the optical transceiver sub-assembly 400 in the optical network terminal according to an embodiment of the present disclosure. As shown in fig. 2 and fig. 3, the optical network terminal provided in the embodiment of the present application includes an optical transceiver sub-module 400, a flexible circuit board 500, and an optical fiber adapter 600, where the optical transceiver sub-module 400 is directly disposed on the circuit board 105, and is electrically connected to the circuit board 105, and is used for transmitting and receiving signal light; one end of the flexible circuit board 500 is electrically connected with the optical transceiver sub-assembly 400, and the other end is electrically connected with the circuit board 105, so that the electrical connection between the optical transceiver sub-assembly 400 and the circuit board 105 is realized through the flexible circuit board 500; the optical fiber adapter 600 is inserted into the optical port of the optical network terminal 100, and one end of the optical fiber adapter is connected to the other end of the optical transceiver sub-module 400, and the other end of the optical fiber adapter is connected to an external optical fiber, so that transmission of emitted light and received light of the optical transceiver sub-module 400 is realized through the optical fiber adapter 600.

Fig. 4 is an assembly schematic diagram of an optical transceiver sub-module 400, a flexible circuit board 500 and an optical fiber adapter 600 in an optical network terminal 100 according to an embodiment of the present disclosure, and fig. 5 is an exploded schematic diagram of the optical transceiver sub-module 400 and the flexible circuit board 500 in the optical network terminal 100 according to an embodiment of the present disclosure. As shown in fig. 4 and 5, the Optical transceiver sub-module 400 includes an Optical transmitter and an Optical receiver, the flexible circuit board 500 in this application is a transmitting adapter board for a 10G PON (Passive Optical Network), a gold pin of the Optical transmitter is electrically connected to the flexible circuit board 500, and the flexible circuit board 500 is electrically connected to the circuit board 105. The light emitting device comprises components such as a laser and a lens, the components such as the laser are indirectly and electrically connected with the circuit board 105 through the flexible circuit board 500, so that the circuit board 105 transmits a driving signal to the components such as the laser through the flexible circuit board 500 to drive the laser and the like to generate laser beams, the laser beams are converged and coupled to the optical fiber adapter 600 through the lens and the like, and then the beams are transmitted to an external optical fiber through the optical fiber adapter 600, so that light emission is realized.

The gold pins of the light receiving device are directly electrically connected to the circuit board 105, so that the circuit board 105 directly transmits the driving signal to the light receiving device. The light receiving device comprises components such as a lens, a light detector, a transimpedance amplifier and the like, and the components such as the light detector, the transimpedance amplifier and the like are directly and electrically connected with the circuit board 105 through gold pins so as to directly drive the components such as the light detector, the transimpedance amplifier and the like to work. The optical fiber adapter 600 transmits signal light transmitted by an external optical fiber to the lens, the signal light beam is converged to the optical detector through the lens, the optical signal is converted into an electrical signal through the optical detector, the electrical signal is amplified through the transimpedance amplifier, the amplified electrical signal is emitted through the gold needle, the amplified electrical signal is transmitted to the circuit board 105 through the flexible circuit board 500, and the signal is processed and forwarded through the circuit board 105.

Fig. 6 is a schematic structural diagram of a flexible circuit board 500 in an optical network terminal 100 according to an embodiment of the present application, and fig. 7 is a schematic partial structural diagram of a circuit board 105 in an optical network terminal 100 according to an embodiment of the present application. As shown in fig. 6 and 7, the flexible circuit board 500 includes a first connection portion 510 and a second connection portion 520, the first connection portion 510 is provided with a plurality of connection holes 5101, and the emission gold pins of the optical transceiver sub-module 400 are connected to the first connection portion 510 through the plurality of connection holes 5101, so that the electrical connection between the light emitting device of the optical transceiver sub-module 400 and the flexible circuit board 500 is realized.

The second connecting portion 520 is electrically connected to the circuit board 105, and in order to facilitate the connection and fixation of the second connecting portion 520 and the circuit board 105, the two sides of the connection between the second connecting portion 520 and the circuit board 105 are respectively provided with a second positioning hole 5201, the connection between the circuit board 105 and the second connecting portion of the flexible circuit board 500 is provided with a pad 108, and a first positioning hole 1081 is correspondingly arranged below the second positioning hole 5201, the flexible circuit board 500 can be positioned with the circuit board 105 through the first positioning hole 1081 and the second positioning hole 5201, that is, the first positioning hole 1081 is aligned with the second positioning hole 5201 for positioning and welding, after the positioning is completed, the first positioning hole 1081 and the second positioning hole 5201 are positioned and welded, so as to achieve the welding and fixation of the flexible circuit board 500 and the circuit board 105.

A signal pad 5202 is further disposed at an end of the second connecting portion 520 away from the rosa 400, the signal pad 5202 is located at a right edge of the second connecting portion 520, and the signal pads 5202 are sequentially arranged along a width direction (front-back direction) of the flexible circuit board 500; the PCB pad 1082 is correspondingly disposed on the circuit board 105 below the signal pad 5202, and after the second connecting portion 520 of the flexible circuit board 500 is positioned and connected to the circuit board 105, the signal pad 5202 is electrically connected to the PCB pad 1082, thereby achieving the electrical connection between the flexible circuit board 500 and the circuit board 105.

In the embodiment of the present application, the second positioning hole 5201 on the flexible circuit board 500 is a circular hole pad, and the first positioning hole 1081 on the circuit board 105 is a circular hole pad corresponding to the second positioning hole 5201. That is, the second positioning holes 5201 disposed on both sides of the joint of the flexible circuit board 500 and the circuit board 105 are designed as semicircular holes (180 ° circular arcs) and the solder pads are formed by semicircular through holes, so as to enhance the tin penetration rate and ensure the positioning and welding effect of the flexible circuit board 500.

In order to match the semi-circular hole pad design on both sides of the flexible circuit board 500, the circuit board 105 is packaged except for matching the size of the normal optical transceiver sub-module 400, the first positioning holes 1081 arranged on both sides of the joint of the flexible circuit board 500 and the circuit board 105 adopt a full through hole (360-degree conventional through hole) design, and the full through hole radius size of the first positioning holes 1081 is consistent with the half through hole radius size of the second positioning holes 5201 on the flexible circuit board 500, so that after the first positioning holes 1081 and the second positioning holes 5201 are positioned and aligned, the full through holes of the first positioning holes 1081 and the half through holes of the second positioning holes 5201 can be filled with tin materials, so as to realize the positioning welding of the first positioning holes 1081 and the second positioning holes 5201.

In the embodiment of the present application, the size of the PCB pad 1082 on the circuit board 105 is slightly larger than or equal to the size of the signal pad 5202 on the flexible circuit board 500, which not only increases the soldering strength between the PCB pad 1082 and the signal pad 5202, but also facilitates the soldering inspection.

Fig. 8 is a schematic circuit diagram of a flexible circuit board 500 in an optical network terminal according to an embodiment of the present application. As shown in fig. 8, a signal differential line is disposed on the flexible circuit board 500 to connect the first connection portion 510 and the second connection portion 520 of the flexible circuit board 500 through the signal differential line, so as to realize signal transmission on the flexible circuit board 500. Specifically, the signal pad 5202 on the second connecting portion 520 includes a high-speed signal pad 5203 and a low-speed signal pad 5204, a high-speed signal differential line 530 and a low-speed signal differential line 540 are disposed on the surface of the flexible circuit board 500, one end of the high-speed signal differential line 530 is electrically connected to a connection hole 5101 of the first connecting portion 510, and the other end is electrically connected to the high-speed signal pad 5203, so as to implement high-speed signal transmission between the optical sub-transceiver module 400 and the flexible circuit board 500; one end of the low-speed signal differential line 540 is electrically connected to the other connecting hole 5101 of the first connecting portion 510, and the other end is electrically connected to the low-speed signal pad 5204, so that low-speed signal transmission between the optical transceiver sub-assembly 400 and the flexible circuit board 500 is realized.

Fig. 9 is an assembly diagram of an optical transceiver sub-assembly 400, a flexible circuit board 500 and a circuit board 105 in an optical network terminal according to an embodiment of the present application, and fig. 10 is an enlarged diagram of a point a in fig. 9. As shown in fig. 9 and 10, when the flexible circuit board 500 and the circuit board 105 are soldered, the soldering tool needs to fix the circuit board 105, two positioning pins 800 are placed on the tool, and the first positioning hole 1081 on the circuit board 105 and the second positioning hole 5201 on the flexible circuit board 500 are soldered by the positioning pins 800, so as to perform positioning soldering between the flexible circuit board 500 and the circuit board 105.

The way of fixing the circuit board 105 by the tooling may be to make a tray according to the circuit board profile, or to design fixing posts according to large through holes (e.g. screw holes) on the circuit board 105, and to fix the circuit board 105 by the tray or the fixing posts to solder the circuit board 105 and the flexible circuit board 500.

In order to facilitate the positioning and welding of the flexible circuit board 500 and the circuit board 105 by the positioning pin 800, the radius of the positioning pin 800 needs to be identical to or slightly smaller than the radius of the full-circle through hole of the first positioning hole 1081 on the circuit board 105 and the radius of the half-circle through hole of the second positioning hole 5201 on the flexible circuit board 500, so as to facilitate the insertion of the positioning pin 800 into the first positioning hole 1081 and the second positioning hole 5201; meanwhile, the spacing between the two positioning pins 800 needs to be consistent with the spacing of the first positioning holes 1081 on both sides of the circuit board 105.

In the embodiment of the application, the lengths of the two positioning pins 800 arranged on the circuit board welding tool are preferably equal to the thickness of the circuit board 105 plus 1-2 mm, so that the flexible circuit board 500 is conveniently fixed, and the arrangement and welding of the flexible circuit board 500 are not influenced.

The optical network terminal 100 provided in the embodiment of the present application further includes a shielding cover 700, where the shielding cover 700 is disposed on the optical sub-transceiver module 400 and used for packaging the optical sub-transceiver module 400 to shield the electromagnetic waves generated by the optical sub-transceiver module 400, so as to prevent the electromagnetic waves from leaking into the optical network terminal 100 and affecting the performance of other electrical components in the optical network terminal 100, thereby improving the EMI performance of the optical network terminal 100.

Specifically, as shown in fig. 7, a plurality of mounting holes 1051 are formed around the optical transceiver sub-module 400 on the circuit board 105, a plurality of mounting posts are arranged on the bottom side of the shielding cover 700, and the mounting posts of the shielding cover 700 are respectively embedded in the mounting holes 1051 of the circuit board 105, so that the bottom side of the shielding cover 700 contacts with the upper side of the circuit board 105, and thus a sealed cavity is formed by the shielding cover 700 and the circuit board 105, and the optical transceiver sub-module 400 is disposed in the sealed cavity.

The optical network terminal provided by the embodiment of the application comprises a circuit board, an optical transceiver sub-module and a flexible circuit board, wherein a PCB (printed circuit board) pad and a first positioning hole are arranged on the circuit board, the flexible circuit board comprises a first connecting part and a second connecting part which are connected, one end of the optical transceiver sub-module is electrically connected with the first connecting part, a signal pad corresponding to the PCB pad and a second positioning hole corresponding to the first positioning hole are arranged on the second connecting part, the second positioning holes are symmetrically arranged on two sides of the flexible circuit board, and the first positioning hole and the second positioning hole are positioned and welded to realize the positioning connection of the flexible circuit board and the circuit board; the signal pad is electrically connected with the PCB pad, so that the flexible circuit board is electrically connected with the circuit board; when the flexible circuit board is welded with the circuit board, a welding tool is needed, a positioning needle is placed at a position, corresponding to the first positioning hole and the second positioning hole, on the welding tool, the positioning needle is inserted into the first positioning hole and the second positioning hole, and then the first positioning hole and the second positioning hole are welded together through the positioning needle, so that the positioning welding of the flexible circuit board and the circuit board is realized; after the first positioning hole of the circuit board is in positioning welding with the second positioning hole of the flexible circuit board, the PCB pad on the circuit board is correspondingly connected with the signal pad on the flexible circuit board, and signal transmission between the flexible circuit board and the circuit board is realized. The utility model provides an optical network terminal is applied to the BoB technique, with light transceiver secondary module direct mount on the circuit board to receive transceiver secondary module and circuit board through the electric connection of flexible circuit board, the flexible circuit board welds through the second locating hole that sets up on it and the first locating hole on the circuit board, the location of having realized flexible circuit board and circuit board is connected, the flexible circuit board is connected through the signal pad that sets up on it and the PCB pad electricity on the circuit board, the electricity of having realized flexible circuit board and circuit board is connected. The flexible circuit board in this application passes through the locating hole direct mount on the circuit board, compares in traditional bonding, and this kind of fixed mode, very big flexible circuit board fracture of having avoided the too big cause of bonding pressure compares in automatic mechanical welding, does not need expensive equipment in earlier stage to drop into, compares in traditional manual welding, and very big promotion of this kind of fixed mode welded yields and efficiency are a relative economy, efficient production and processing mode.

It should be noted that, in the present specification, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a circuit structure, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such circuit structure, article, or apparatus. Without further limitation, the presence of an element identified by the phrase "comprising an … …" does not exclude the presence of other like elements in a circuit structure, article or device comprising the element.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.

The above-described embodiments of the present application do not limit the scope of the present application.

Claims

1. An optical network terminal, comprising:

2. The optical network terminal according to claim 1, wherein a positioning pin is embedded between the first positioning hole and the second positioning hole, and the first positioning hole is welded to the second positioning hole through the positioning pin.

3. The optical network terminal according to claim 2, wherein the length of the positioning pin is + 1-2 mm of the thickness of the circuit board.

4. The optical network terminal of claim 1, wherein the second positioning hole is a circular hole pad, and the first positioning hole is a circular hole pad corresponding to the second positioning hole.

5. The optical network terminal of claim 4, wherein the second positioning hole is a semicircular hole pad, and a radius of the semicircular hole pad is consistent with a radius of the circular hole of the first positioning hole in size.

6. The optical network terminal according to claim 1, wherein the flexible circuit board comprises a first connection portion and a second connection portion, the first connection portion is provided with a plurality of connection holes, and the gold pins of the optical transceiver sub-assembly are connected with the first connection portion through the connection holes;

the second positioning holes are symmetrically arranged on two sides of the joint of the second connecting part and the circuit board, and the signal bonding pad is arranged at one end, close to the PCB bonding pad, of the second connecting part.

7. The ONT of claim 6, wherein the signal pads comprise a high-speed signal pad and a low-speed signal pad, the flexible printed circuit board is provided with a high-speed signal differential line and a low-speed signal differential line, one end of the high-speed signal differential line is electrically connected to a connection hole of the first connection portion, the other end of the high-speed signal differential line is electrically connected to the high-speed signal pad, one end of the low-speed signal differential line is electrically connected to another connection hole of the first connection portion, and the other end of the low-speed signal differential line is electrically connected to the low-speed signal pad.

8. The optical network terminal of claim 1, wherein the PCB pad has a size greater than or equal to a size of the signal pad.

9. The optical network terminal of claim 1, further comprising a shielding cover, wherein the shielding cover is disposed on the optical sub-assembly for encapsulating the optical sub-assembly.

10. The optical network terminal of claim 9, wherein a plurality of mounting holes are formed around the optical sub-assembly on the circuit board, and the shielding can is mounted on the circuit board through the mounting holes.