CN210835357U

CN210835357U - Optical module

Info

Publication number: CN210835357U
Application number: CN201922322726.8U
Authority: CN
Inventors: 刘洪波; 张超; 张显建
Original assignee: Innolight Technology Suzhou Ltd
Current assignee: Xuchuang Technology Co.,Ltd.
Priority date: 2019-12-23
Filing date: 2019-12-23
Publication date: 2020-06-23
Anticipated expiration: 2029-12-23

Abstract

The application discloses an optical module, which comprises a metal shell, wherein an accommodating cavity is formed in the metal shell, and an optical port and an electric port are formed at two ends of the accommodating cavity; the accommodating cavity is internally provided with an optoelectronic assembly and a circuit board, the optical port is provided with an optical fiber connector, two ends of the optoelectronic assembly are respectively connected with the optical fiber connector and the circuit board, and the circuit board is provided with an electric connector extending out of the electrical port; the circuit board is sleeved with an annular magnetic bead at a position close to the electric port, and the annular magnetic bead forms a magnetic field for shielding electromagnetic radiation near the electric port of the shell. The annular magnetic beads are added near the electric port of the optical module to form a magnetic field for shielding electromagnetic radiation near the electric port, so that electromagnetic leakage caused by gaps of the optical port is avoided, and the anti-electromagnetic interference performance of the optical module can be effectively improved; the annular magnetic beads can inhibit common-mode signals, prevent the common-mode signals from oscillating back and forth between circuits, and reduce interference between channels; simple structure, equipment convenient and fast has improved production efficiency greatly.

Description

Optical module

Technical Field

The application relates to the technical field of optical communication, in particular to an optical module.

Background

The optical module is a commonly used electronic component in the field of optical fiber communication, the position of the optical module needs to be locked in the using process to ensure a good and stable using effect, and the transmission speed of the optical module is continuously improved along with the continuous improvement of the requirements of people on the transmission efficiency. As the transmission rate of the optical module is increased, the phenomenon of Electromagnetic Interference (EMI) is also becoming more serious, and the Electromagnetic Interference is generated by electronic components inside the optical module. As shown in fig. 1, the upper shell 110 and the lower shell 120 of the metal package shell 100 of the optical module are rigidly connected to each other, and a certain gap exists between the joint surfaces, especially in the optical module with a hot-plug structure, and the gold finger 210 of the circuit board leaks out of the shell 100, which results in a larger gap 130 between the circuit board adjacent to the gold finger 210 and the shell, and the shell 100 is not continuous in electrical conduction, which causes strong radiation of electromagnetic waves at this position, which affects the shielding performance of the shell and easily interferes with other electronic components.

In order to solve the above-mentioned problem of electromagnetic interference (EMI), in the prior art, a wave-absorbing plate or a conductive material is added at the gap between the upper and lower housings, such as the optical port and the electrical port, to absorb electromagnetic waves or shield electromagnetic radiation. For example, the chinese patent "a metal-encapsulated optical transceiver module" (patent No. CN201320889410.7) discloses a metal-encapsulated optical transceiver module, which includes: a base, a top cover, a PCB circuit board, the first, the second and the third elastic conductors. A shielding baffle plate extending downwards is arranged at the rear end of the upper cover, and the first elastic conductor is attached to the peripheral side wall of the shielding baffle plate; the second elastic conductor is attached to the peripheral side wall of the upper cover and is in conductive connection with the side wall of the base; the third elastic conductor is attached to the bottom of the base; the upper surface and the lower surface of the rear end of the PCB are respectively provided with a plurality of conductive holes corresponding to the first elastic conductor and the third elastic conductor, and the inner wall and the periphery of the hole are plated with conductive metal films. The elastic conductor is generally a conductive rubber strip or a conductive foam. The second elastic conductor of the front end of the module is extruded with the side wall of the base to form better conductive connection, and the base, the PCB and the upper cover form conductive contact at the rear end of the module, so that a complete electromagnetic shielding cavity is formed inside the whole optical module, and the electromagnetic shielding effect of the optical transceiver module is effectively improved.

According to the anti-electromagnetic interference solution for filling the gap between the shells of the optical module with the wave-absorbing material or the conductive material, although electromagnetic leakage can be reduced well, the better electromagnetic shielding effect can be realized only by completely filling the gap between the shells with the wave-absorbing material or the conductive material, namely the wave-absorbing material or the conductive material has a good attaching effect with the shells and the circuit board, and has higher requirements on the precision of structural design and the assembly technology. In addition, the structure can only reduce the electromagnetic interference between the inside and the outside of the optical module, and the mutual interference of common-mode signals between the internal circuits of the optical module still exists.

Disclosure of Invention

An object of the application is to provide an optical module, have good electromagnetic shield effect and common mode signal suppression effect, the equipment is simple.

In order to achieve one of the above objects, the present application provides an optical module, including a metal housing, where the metal housing has a receiving cavity therein, and both ends of the receiving cavity have an optical port and an electrical port; the accommodating cavity is internally provided with an optoelectronic assembly and a circuit board, the optical port is provided with an optical fiber connector, and the optoelectronic assembly is connected with the optical fiber connector; the photoelectric assembly is electrically connected with the circuit board, and the circuit board is provided with an electric connector extending out of the electric port; the method is characterized in that: the circuit board is sleeved with an annular magnetic bead at a position close to the electric port, and the annular magnetic bead forms a magnetic field for shielding electromagnetic radiation near the electric port of the shell.

As a further improvement of the embodiment, a first limiting portion is arranged at a position of the circuit board close to the electric port, a second limiting portion is arranged in the metal shell, and the first limiting portion and the second limiting portion are matched to limit the position of the annular magnetic bead.

As a further improvement of the embodiment, the first limiting part is a limiting step arranged on two sides of the circuit board.

As a further improvement of the embodiment, the metal shell includes an upper shell and a lower shell, and the second limiting portion is a first flange provided on an inner surface of the upper shell and a second flange provided on an inner surface of the lower shell.

As a further improvement of the embodiment, the metal shell includes an upper shell and a lower shell, and the second limiting portions are protrusions respectively disposed in two side walls of the lower shell.

As a further improvement of the embodiment, a limiting groove is arranged in the metal shell, and the limiting groove is used for limiting the position of the annular magnetic beads.

As a further improvement of the embodiment, the metal case includes an upper case and a lower case; the limiting groove is arranged on the inner surface of the upper shell and/or the lower shell; or the limiting grooves are formed in two side walls of the lower shell.

As a further improvement of the embodiment, the shape of the annular magnetic bead is a quasi-rectangular annular body or an oblong annular body.

As a further improvement of the embodiment, a bayonet is arranged at the position of the circuit board close to the electric port; the annular magnetic bead comprises two semi-rings which are mutually attracted, and the semi-rings are mutually attracted and clamped at the clamping opening of the circuit board.

As a further refinement of the embodiment, the electrical connector comprises a gold finger.

The beneficial effect of this application: the annular magnetic beads are added near the electric port of the optical module to form a magnetic field for shielding electromagnetic radiation near the electric port, so that electromagnetic leakage caused by gaps of the optical port is avoided, and the anti-electromagnetic interference performance of the optical module can be effectively improved; the annular magnetic beads can inhibit common-mode signals, prevent the common-mode signals from oscillating back and forth between circuits, and reduce interference between channels; simple structure, equipment convenient and fast has improved production efficiency greatly.

Drawings

FIG. 1 is a diagram illustrating a package structure of a conventional optical module;

FIG. 2 is an exploded view of an optical module according to example 1 of the present application;

FIG. 3 is an exploded view of an optical module according to example 2 of the present application;

fig. 4 is an exploded view of an optical module according to embodiment 3 of the present application.

Detailed Description

The present application will now be described in detail with reference to specific embodiments thereof as illustrated in the accompanying drawings. These embodiments are not intended to limit the present application, and structural, methodological, or functional changes made by those skilled in the art according to these embodiments are included in the scope of the present application.

In the various illustrations of the present application, certain dimensions of structures or portions may be exaggerated relative to other structures or portions for ease of illustration and, thus, are provided to illustrate only the basic structure of the subject matter of the present application.

Also, terms used herein such as "upper," "above," "lower," "below," and the like, denote relative spatial positions of one element or feature with respect to another element or feature as illustrated in the figures for ease of description. The spatially relative positional terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. When an element or layer is referred to as being "on," or "connected" to another element or layer, it can be directly on, connected to, or intervening elements or layers may be present.

Example 1

As shown in fig. 2, this embodiment provides an optical module with good EMI resistance, which includes a metal case, an optoelectronic package 300, a circuit board 200, and a ring-shaped magnetic bead 400. The metal shell includes an upper shell 110 and a lower shell 120, the upper shell 110 and the lower shell 120 are covered to form an accommodating cavity 160, two ends of the accommodating cavity 160 are provided with an optical port and an electrical port, the optoelectronic component 300 and the circuit board 200 are arranged in the accommodating cavity 160, the optical port is provided with the optical fiber connector 140, the optical connection end 310 of the optoelectronic component 300 is connected with the optical fiber connector 140, and the electrical connection end 320 is electrically connected with the circuit board 200. While the optoelectronic device 300 is illustrated as assembling all optoelectronic components on a carrier and connecting with the circuit board 200, in other embodiments, the optoelectronic device may also adopt other assembling structures, such as the receiving terminal and the emitting terminal are respectively mounted on different carriers, or are respectively connected with the circuit board in a coaxial assembly manner, and so on, and it is within the scope of the present application. The circuit board 200 is provided with an electrical connector 210 extending out of the housing electrical port, where the electrical connector 210 is a gold finger. The annular magnetic bead 400 is sleeved on the circuit board 200 at a position close to the electric port, and the annular magnetic bead 400 forms a magnetic field for shielding electromagnetic radiation near the electric port of the housing, so that electromagnetic leakage caused by a gap of the optical port is avoided, and the anti-electromagnetic interference performance of the optical module can be effectively improved; and the annular magnetic beads can inhibit common-mode signals, prevent the common-mode signals from oscillating back and forth between circuits, and reduce the interference between channels.

In this embodiment, the annular magnetic bead 400 is a rectangular-like annular body, a first position-limiting portion is disposed at a position of the circuit board 200 near the electric port, a second position-limiting portion is disposed in the metal housing, and the first position-limiting portion and the second position-limiting portion cooperate to limit the position of the annular magnetic bead. Here, the metal case includes an upper case 110 and a lower case 120, the second position-limiting portions are protrusions 150 respectively disposed in both side walls of the lower case 120, and the first position-limiting portions are position-limiting steps 220 disposed on both sides of the circuit board 200. During assembly, the annular magnetic bead 400 is sleeved on the circuit board and abuts against the limit step 220 of the circuit board 200, then the circuit board 200 sleeved with the annular magnetic bead 400 is installed in the lower shell 120, the annular magnetic bead 400 is clamped between the limit step 220 of the circuit board 200 and the protrusions 150 in the two side walls of the lower shell 120, the photoelectric component 300 is also installed in the lower shell 120 at the same time or successively, after the circuit board 200 and the photoelectric component 300 are fixed, the upper shell 110 is covered to compress the annular magnetic bead 400 between the limit step 220 of the circuit board 200 and the protrusions 150 in the two side walls of the lower shell 120, and the assembly is completed. In this embodiment, a fixed knot for installing cyclic annular magnetic bead constructs simply, and equipment convenient and fast can improve production efficiency greatly.

In this embodiment, the second position-limiting portions are protrusions respectively disposed on two sidewalls of the lower housing, and in other embodiments, the second position-limiting portions may also be a first flange respectively disposed on an inner surface of the upper housing and a second flange respectively disposed on an inner surface of the lower housing. The annular magnetic bead is a rectangular annular body, and in other embodiments, the annular bead may be an oblong annular body, an integral annular body, or an annular body formed by attracting two half rings.

Example 2

Different from embodiment 1, in this embodiment, different limiting structures are used in the optical module to clamp the annular magnetic beads, where the limiting structure is a limiting groove disposed in the metal housing for limiting the position of the annular magnetic beads. As shown in fig. 3, in this embodiment, the metal housing also includes an upper housing 110 and a lower housing 120, the above-mentioned limiting grooves 170 are disposed in two sidewalls of the lower housing 120, and the annular magnetic beads 400 also adopt a quasi-rectangular annular body. During assembly, the annular magnetic bead 400 is sleeved on the circuit board 200, the circuit board 200 sleeved with the annular magnetic bead 400 is installed in the lower shell 120, the annular magnetic bead 400 is clamped in the limiting grooves 170 in the two side walls of the lower shell 120, the photoelectric component 300 is also installed in the lower shell 120 at the same time or successively, after the circuit board 200 and the photoelectric component 300 are fixed, the upper shell 110 is covered to compress the annular magnetic bead 400 in the limiting grooves 170, and the assembly is completed. In this embodiment, need not set up the limit structure who is used for restricting cyclic annular magnetic bead position on the circuit board, reduced the processing cost of circuit board, establish limit structure on the casing down, directly go into the spacing inslot with cyclic annular magnetic bead card during the installation circuit board, equipment convenient and fast, it is with low costs.

In this embodiment, the position limiting grooves are formed in both side walls of the lower case, and in other embodiments, the position limiting grooves may be formed in the inner surfaces of the upper case and the lower case, and the annular magnetic beads may be clamped from the upper surface and the lower surface of the circuit board, respectively, to fix the positions of the annular magnetic beads.

Example 3

As shown in fig. 4, unlike embodiments 1 and 2, the annular magnetic bead 400 in this embodiment includes two half rings that are attached to each other, and here, an upper half ring 410 and a lower half ring 420 that are respectively mounted on the upper and lower sides of the circuit board 200 are attached to each other to form the annular magnetic bead 400. The limiting structure in this embodiment is also different from embodiments 1 and 2, in this embodiment, the housing does not need to be provided with a limiting structure, but a bayonet 230 is provided at a position on the circuit board 200 near the electrical port of the housing, two half rings of the annular magnetic bead 400 are attracted to each other and clamped at the bayonet 230 of the circuit board 200, and the position of the annular magnetic bead 400 is limited by the bayonet 230 on the circuit board 200. During assembly, the two half rings (the upper half ring 410 and the lower half ring 420) of the annular magnetic bead 400 are respectively clamped into the bayonet 230 of the circuit board 200 from the top and the bottom of the circuit board 200, so that the upper half ring 410 and the lower half ring 420 of the annular magnetic bead 400 are mutually attracted together to form a rectangular annular body, the circuit board 200 and the optoelectronic component 300 are installed in the lower housing 120, and after the circuit board 200 and the optoelectronic component 300 are fixed, the upper housing 110 is covered to complete assembly. This structure only need set up the bayonet socket of the cyclic annular magnetic bead position of restriction on the circuit board can, go up the internal limit structure who need not establish cyclic annular magnetic bead of casing or inferior valve, can be compatible with current casing, need not the die sinking in addition, can practice thrift a large amount of costs.

The above list of details is only for the concrete description of the feasible embodiments of the present application, they are not intended to limit the scope of the present application, and all equivalent embodiments or modifications that do not depart from the technical spirit of the present application are intended to be included within the scope of the present application.

Claims

1. An optical module comprises a metal shell, wherein an accommodating cavity is formed in the metal shell, and an optical port and an electric port are formed in two ends of the accommodating cavity; the accommodating cavity is internally provided with an optoelectronic assembly and a circuit board, the optical port is provided with an optical fiber connector, and the optoelectronic assembly is connected with the optical fiber connector; the photoelectric assembly is electrically connected with the circuit board, and the circuit board is provided with an electric connector extending out of the electric port; the method is characterized in that: the circuit board is sleeved with an annular magnetic bead at a position close to the electric port, and the annular magnetic bead forms a magnetic field for shielding electromagnetic radiation near the electric port of the shell.

2. The optical module of claim 1, wherein: the circuit board closes on the position of electric mouth is equipped with first spacing portion, be equipped with the spacing portion of second in the metal casing, the cooperation of first spacing portion and the spacing portion of second restriction the position of cyclic annular magnetic bead.

3. The light module of claim 2, wherein: the first limiting part is a limiting step arranged on two sides of the circuit board.

4. The light module of claim 2, wherein: the metal shell comprises an upper shell and a lower shell, and the second limiting part is a first flange arranged on the inner surface of the upper shell and a second flange arranged on the inner surface of the lower shell.

5. The light module of claim 2, wherein: the metal shell comprises an upper shell and a lower shell, and the second limiting parts are bulges arranged in two side walls of the lower shell respectively.

6. The optical module of claim 1, wherein: a limiting groove is formed in the metal shell and used for limiting the position of the annular magnetic beads.

7. The light module of claim 6, wherein:

the metal shell comprises an upper shell and a lower shell;

the limiting groove is arranged on the inner surface of the upper shell and/or the lower shell;

or the limiting grooves are formed in two side walls of the lower shell.

8. The light module according to any one of claims 1 to 7, characterized in that: the shape of the annular magnetic bead is a quasi-rectangular annular body or a long elliptic annular body.

9. The optical module of claim 1, wherein: a bayonet is arranged at the position of the circuit board close to the electric port; the annular magnetic bead comprises two semi-rings which are mutually attracted, and the semi-rings are mutually attracted and clamped at the clamping opening of the circuit board.

10. The light module according to any one of claims 1-7 or 9, characterized in that: the electrical connector includes a gold finger.