CN113419314A - Novel electromagnetic shielding optical module shell structure - Google Patents
Novel electromagnetic shielding optical module shell structure Download PDFInfo
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- CN113419314A CN113419314A CN202110651711.5A CN202110651711A CN113419314A CN 113419314 A CN113419314 A CN 113419314A CN 202110651711 A CN202110651711 A CN 202110651711A CN 113419314 A CN113419314 A CN 113419314A
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- bottom cover
- shell seat
- wave absorbing
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4274—Electrical aspects
- G02B6/4277—Protection against electromagnetic interference [EMI], e.g. shielding means
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4256—Details of housings
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Electromagnetism (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The invention discloses a novel electromagnetic shielding optical module shell structure, which comprises: the first shielding glue is respectively arranged in a front end groove, a side groove and a tail groove of the die-casting bottom cover, and the second shielding glue is arranged in the tail groove of the die-casting shell seat; bosses are arranged on the periphery of the die-casting shell seat, and conical salient points are arranged on the bosses; when the optical module is assembled, bosses on the die-casting shell seat are respectively in staggered fit with a front end groove, side grooves and a tail groove of the die-casting bottom cover, and conical bosses on the bosses of the die-casting shell seat are in embedded type occlusion sealing with first shielding glue to form a labyrinth structure; the second shielding glue at the tail part of the die-casting shell seat and the first shielding glue at the tail part of the die-casting bottom cover slightly press the mainboard assembly; and the two sides and the middle part of the die-casting bottom cover are respectively provided with a wave absorbing plate, and the jumper wire on the light opening part in the middle part of the main board assembly is pressed by the wave absorbing plate. The invention not only ensures the stability of the optical module structure, but also can realize the good electromagnetic shielding effect of the optical module, and the structure of the invention is simple and convenient for batch production.
Description
Technical Field
The invention relates to the technical field of electromagnetic shielding of an optical module shell structure, in particular to a novel electromagnetic shielding optical module shell structure.
Background
The electromagnetic shielding design in the aspect of the existing optical module structure mainly has the following two defects, a gap exists between the die-casting shell seat of the optical module and the side wall of the die-casting bottom cover in a matched mode, the distance is short, and a gap which is hard to avoid exists between the tail part of the die-casting shell seat of the optical module and the die-casting bottom cover in a matched mode and a PCB.
The first defect is: a gap exists between the die-casting shell seat of the optical module and the side wall of the die-casting bottom cover, and because the die-casting shell seat of the optical module and the die-casting bottom cover are both supported by rigid materials, electromagnetic waves with specific wavelength and wave band can be radiated from a seam between the die-casting shell seat and the die-casting bottom cover to form electromagnetic interference.
The second defect is that: the die-casting shell seat of the optical module and the die-casting bottom cover are hard to fit with the PCB, so that a gap is formed, and electromagnetic waves with specific wavelengths and wave bands can be radiated from the gap to form electromagnetic interference.
Disclosure of Invention
The invention aims to solve the technical problem of providing a novel electromagnetic shielding optical module shell structure aiming at the defects in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the invention provides a novel electromagnetic shielding optical module shell structure, which comprises: the die-casting shell comprises a die-casting shell seat, a die-casting bottom cover, a main board assembly, first shielding glue, second shielding glue, a first wave absorbing plate, a second wave absorbing part and a third wave absorbing plate; the mainboard subassembly is installed between die-casting shell seat and die-casting bottom, wherein:
the front end of the die-casting bottom cover is provided with a front end groove, two sides of the die-casting bottom cover are provided with side grooves, the tail of the die-casting bottom cover is provided with a tail groove, and the first shielding glue is respectively arranged in the front end groove, the side grooves and the tail groove; the tail part of the die-casting shell seat is provided with a tail groove, and the second shielding glue is arranged in the tail groove of the die-casting shell seat; a circle of bosses are arranged on the periphery of the die-casting shell seat, and conical salient points are arranged on the bosses; when the optical module is assembled, bosses on the die-casting shell seat are respectively in staggered fit with a front end groove, side grooves and a tail groove of the die-casting bottom cover, conical bosses on the bosses of the die-casting shell seat are in embedded type occlusion sealing with first shielding glue to form a labyrinth structure, and electromagnetic shielding is carried out through the labyrinth structure;
the second shielding glue at the tail part of the die-casting shell seat and the first shielding glue at the tail part of the die-casting bottom cover slightly press the mainboard assembly; the two sides of the die-casting bottom cover are provided with first wave absorbing plates which are fixedly arranged at the top of the labyrinth structure, the two inner sides of the die-casting shell seat are provided with saw-toothed structures, and electromagnetic waves are reflected to the first wave absorbing plates through the saw-toothed structures to be absorbed; the middle part of the die-casting bottom cover is provided with a second wave absorbing plate, the middle part of the die-casting shell seat is provided with a third wave absorbing plate, and the second wave absorbing plate and the third wave absorbing plate press the jumper wire on the light opening part in the middle part of the mainboard assembly.
Further, the mainboard assembly of the present invention comprises an MT ferrule, an MT jumper and a PCB board, wherein: the MT inserting core is fixed through the die-casting shell seat and the front end of the die-casting bottom cover; the MT jumper is fixed through the middle parts of the die-casting shell seat and the die-casting bottom cover; the tail part of the PCB is fixed through the die-casting shell seat and the tail part of the die-casting bottom cover.
Furthermore, in the optical port part in the middle of the mainboard assembly, the MT jumper is pressed between the second wave absorbing plate and the third wave absorbing plate, electromagnetic waves radiated by the MT jumper are absorbed by the second wave absorbing plate and the third wave absorbing plate, and a gap of the optical port part is blocked; the front end of the optical port fixes one side of the MT insertion core through a labyrinth structure and increases the radiation distance of electromagnetic waves; the rear end of the optical port is matched and fixed with the die-casting shell seat through a first shielding glue on the die-casting bottom cover.
Further, the first shielding glue on the die-casting bottom cover is pressed on the other side of the MT inserting core, so that a gap between the MT inserting core and the die-casting bottom cover is sealed, and an electromagnetic wave radiation gap is reduced.
Furthermore, the sealing structure of the light opening part is of a trapezoid structure, the MT jumper is a trapezoid short side, two sides of the MT jumper are trapezoid side edges, and one side of the die-casting bottom cover is a trapezoid long side.
Further, the trapezoid structure of the invention is sealed by a first shielding glue.
Furthermore, the middle position of the tail part of the optical module is lightly pressed on the tail part of the PCB through the second shielding glue on the die-casting shell seat and the first shielding glue on the die-casting bottom cover, so that the gap of the tail part of the optical module is sealed, and electromagnetic waves are prevented from being radiated from the gap.
Furthermore, the labyrinth structure comprises a shell seat boss and shell seat sawteeth on the die-casting shell seat, and a bottom cover groove on the die-casting bottom cover; the shell base boss and the bottom cover groove are embedded and occluded and sealed, the top of the shell base boss is adhered to the bottom cover groove through first shielding glue, and a first gap is formed between the shell base boss and the bottom cover groove; the shell seat sawtooth is arranged at the bottom of the shell seat boss, the first wave absorbing plate is arranged at the position, located on the die-casting bottom cover, of the side face of the bottom cover groove, a second gap is formed between the first wave absorbing plate and the shell seat sawtooth, and electromagnetic waves are constantly reflected in the first gap and the second gap through the shell seat sawtooth until being absorbed by the first wave absorbing plate and converted into heat energy.
Furthermore, the included angle of the sawteeth of the shell seat is 30-60 degrees.
Furthermore, the height of the conical convex point is 0.2mm, the diameter of the bottom of the conical convex point is 0.55mm, and the gap of the conical point is 1.22mm, so that electromagnetic waves with specific wavelengths can be prevented from being directly radiated.
The invention has the following beneficial effects: according to the novel electromagnetic shielding optical module shell structure, the stability of the optical module structure is ensured and the good electromagnetic shielding effect of an optical module can be realized through the special labyrinth structure and the design of shielding glue; and the structure has the advantages of simple structure, easy realization and low cost, and meets the requirements of small-batch or large-batch production.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is an exploded view of an embodiment of the present invention;
FIG. 2 is a partial view of an embodiment of the present invention;
FIG. 3 is a partial view of an optical port front end and an optical port back end of an embodiment of the present invention;
FIG. 4 is a partial assembly view of a tapered bump in accordance with an embodiment of the present invention;
FIG. 5 is a partial assembly view of an optical port jumper of an embodiment of the present invention;
FIG. 6 is a partial assembly view of a front end labyrinth configuration in accordance with an embodiment of the present invention;
FIG. 7 is a partial assembly view of a trailing labyrinth configuration in accordance with an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The novel electromagnetic shielding optical module shell structure of the embodiment of the invention comprises: the die-casting wave absorption structure comprises a die-casting shell base 1, a die-casting bottom cover 2, a main board assembly 3, a first shielding glue 4, a second shielding glue 5, a first wave absorption plate 6, a second wave absorption part 7 and a third wave absorption plate 8; mainboard subassembly 3 is installed between die-casting shell seat 1 and die-casting bottom 2, wherein:
the front end of the die-casting bottom cover 3 is provided with a front end groove, two sides of the die-casting bottom cover are provided with side grooves, the tail of the die-casting bottom cover is provided with a tail groove, and the first shielding glue 4 is respectively arranged in the front end groove, the side grooves and the tail groove; the tail part of the die-casting shell seat 1 is provided with a tail groove, and the second shielding glue 5 is arranged in the tail groove of the die-casting shell seat 1; a circle of bosses are arranged on the periphery of the die-casting shell seat 1, and conical salient points are arranged on the bosses; when the optical module is assembled, bosses on the die-casting shell seat 1 are respectively in staggered fit with a front end groove, side grooves and a tail groove of the die-casting bottom cover 3, conical bosses on the bosses of the die-casting shell seat 1 are in embedded type occluded sealing with the first shielding adhesive 4 to form a labyrinth structure, and electromagnetic shielding is carried out through the labyrinth structure;
the second shielding glue 5 at the tail part of the die-casting shell seat 1 and the first shielding glue 4 at the tail part of the die-casting bottom cover 2 slightly press the main board assembly 3; the two sides of the die-casting bottom cover 2 are provided with first wave absorbing plates 6, the first wave absorbing plates 6 are fixedly arranged at the top of the labyrinth structure, the two inner sides of the die-casting shell seat 1 are provided with saw-toothed structures, and electromagnetic waves are reflected to the first wave absorbing plates 6 through the saw-toothed structures to be absorbed; the second wave absorbing plate 7 is arranged in the middle of the die-casting bottom cover 2, the third wave absorbing plate 8 is arranged in the middle of the die-casting shell seat 1, and the second wave absorbing plate 7 and the third wave absorbing plate 8 press the jumper wire on the light opening part in the middle of the main board assembly 3.
The electromagnetic shielding design in the aspect of the existing optical module shell structure has the following problems that a gap exists between the die-casting shell seat of the optical module and the side edge of the die-casting bottom cover in the assembling process, and because the die-casting shell seat and the die-casting bottom cover are supported by rigid materials, electromagnetic waves with specific wavelengths and wave bands can be scattered from a matching joint between the die-casting shell seat and the die-casting bottom cover to form electromagnetic interference. The die-casting shell seat of the optical module and the die-casting bottom cover are hard to fit with the PCB, so that a gap is formed, and electromagnetic waves with specific wavelengths and wave bands can be radiated from the gap to form electromagnetic interference.
Aiming at the defects of the first optical module, a convex structure is designed on the side of a die-casting shell seat, conical convex points are designed on three sides of the convex structure, a concave structure is designed on the side of a die-casting bottom cover, a groove is designed in the concave structure, and shielding glue is arranged in the groove, so that the die-casting shell seat and the die-casting bottom cover are meshed through the convex and concave structures to form a labyrinth, the electromagnetic radiation distance is increased, the conical convex points on a boss of the die-casting shell seat and the shielding glue on the die-casting bottom cover are inlaid in trial meshing, the gap between two metal shells is filled, the two shells are well matched, namely a wall is added for electromagnetic radiation, the electromagnetic radiation is greatly weakened through the metal wall, and a good electromagnetic shielding effect is formed.
To second kind of optical module defect, this novel design is glued at die-casting shell seat afterbody point shielding and is lightly pressed mainboard subassembly with die-casting bottom afterbody shielding, fills the clearance between mainboard and shell, all seals mainboard subassembly components and parts inside the optical module. The possibility of electromagnetic radiation is greatly weakened, and a good electromagnetic shielding effect is formed.
The mainboard assembly 3 comprises an MT inserting core 301, an MT jumper 302 and a PCB 303, wherein: the MT insertion core 301 is fixed through the front ends of the die-casting shell seat 1 and the die-casting bottom cover 2; the MT jumper 302 is fixed through the middle parts of the die-casting shell base 1 and the die-casting bottom cover 2; the tail of the PCB 303 is fixed by the die-cast housing base 1 and the tail of the die-cast bottom cover 2.
In the optical port part in the middle of the mainboard assembly 3, the MT jumper 302 is pressed between the second wave absorbing plate 7 and the third wave absorbing plate 8, the electromagnetic wave radiated by the MT jumper 302 is absorbed by the second wave absorbing plate 7 and the third wave absorbing plate 8, and the gap of the optical port part is blocked; the optical port front end 401 fixes one side of the MT ferrule 301 through a labyrinth structure and increases the electromagnetic wave radiation distance; the optical port rear end 402 is fixed to the die-cast housing base 1 by the first shielding adhesive 4 on the die-cast bottom cover 2.
The first shielding glue 4 on the die-casting bottom cover 2 is pressed on the other side of the MT insertion core 301, so that the gap between the MT insertion core 301 and the die-casting bottom cover 2 is sealed, and the electromagnetic wave radiation gap is reduced.
The sealing structure of the light opening part is of a trapezoidal structure, the MT jumper 302 is a trapezoidal short side, the two sides of the MT jumper 302 are trapezoidal side edges, and one side of the die-casting bottom cover 2 is a trapezoidal long side.
The ladder structure is sealed by a first shielding glue 4.
The middle position of the tail of the optical module is lightly pressed on the tail of the PCB 303 through the second shielding glue 5 on the die-casting shell base 1 and the first shielding glue 4 on the die-casting bottom cover 2, so as to block the gap of the tail of the optical module and prevent the electromagnetic wave from radiating from the gap.
The labyrinth structure comprises a shell seat boss 501 and shell seat sawteeth 502 on the die-casting shell seat 1 and a bottom cover groove 503 on the die-casting bottom cover 2; the shell base boss 501 and the bottom cover groove 503 are embedded and occluded for sealing, the top of the shell base boss 501 is adhered to the bottom cover groove 503 through the first shielding glue 4, and a first gap 504 is arranged between the shell base boss 501 and the bottom cover groove 503; the shell-seat sawteeth 502 are arranged at the bottom of the shell-seat boss 501, the first wave absorbing plate 6 is arranged on the die-cast bottom cover 2 at a position on the side of the bottom cover groove 503, the second gap 505 is arranged between the first wave absorbing plate 6 and the shell-seat sawteeth 502, and the electromagnetic wave 506 is continuously reflected in the first gap 504 and the second gap 505 through the shell-seat sawteeth 502 until being absorbed by the first wave absorbing plate 6 and converted into heat energy.
The included angle of the saw teeth of the shell seat 502 is 30-60 degrees.
The height of the conical convex point is 0.2mm, the diameter of the bottom of the conical convex point is 0.55mm, the gap of the conical point is 1.22mm, the conical point can prevent electromagnetic waves with specific wavelengths from directly radiating out, and the conical point can be easily occluded into the shielding glue. The occlusion is tight to reduce the housing assembly clearance.
The invention can be applied to all optical modules and structures needing to generate electromagnetic shielding effect. The main factors determining the slot shielding effect are: the maximum size of the gap and the depth of the gap. Therefore, the following electromagnetic shielding structure design is provided for the two major influencing factors.
Due to the structural function of the shield, a large number of gaps exist. The shield design of these slots is the most complex and critical part of the shield design. The shielding design of the slot is the most critical technology for embodying the level of a designer.
The shielding of the slot can be roughly divided into two types: fastening points (including screws, rivets, spot welding, latches, etc.) are directly connected; and installing shielding materials in the gaps to realize flexible connection. The shielding effectiveness of the slot is related to the characteristics of the electromagnetic wave, the permeability and conductivity of the material, the maximum size of the slot, the depth of the slot, and other factors. The most important of the structural schemes are the maximum size of the slot and the depth of the slot, which are the main factors for determining the shielding effect of the slot. According to the conclusion of analysis, the maximum size of the gap is reduced, and the shielding effectiveness of the gap is improved by increasing the depth of the gap.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (10)
1. A novel electromagnetic shielding optical module shell structure is characterized in that the structure comprises: the die-casting shell comprises a die-casting shell seat (1), a die-casting bottom cover (2), a main board assembly (3), first shielding glue (4), second shielding glue (5), a first wave absorbing plate (6), a second wave absorbing part (7) and a third wave absorbing plate (8); mainboard subassembly (3) are installed between die-casting shell seat (1) and die-casting bottom cover (2), wherein:
the front end of the die-casting bottom cover (3) is provided with a front end groove, two sides of the die-casting bottom cover are provided with side grooves, the tail of the die-casting bottom cover is provided with a tail groove, and the first shielding glue (4) is respectively arranged in the front end groove, the side grooves and the tail groove; the tail part of the die-casting shell seat (1) is provided with a tail groove, and the second shielding glue (5) is arranged in the tail groove of the die-casting shell seat (1); a circle of bosses are arranged on the periphery of the die-casting shell seat (1), and conical salient points are arranged on the bosses; when the optical module is assembled, bosses on the die-casting shell seat (1) are respectively in staggered fit with a front end groove, side grooves and a tail groove of the die-casting bottom cover (3), conical bosses on the bosses of the die-casting shell seat (1) are in embedded type occlusion sealing with the first shielding glue (4) to form a labyrinth structure, and electromagnetic shielding is carried out through the labyrinth structure;
the second shielding glue (5) at the tail part of the die-casting shell seat (1) and the first shielding glue (4) at the tail part of the die-casting bottom cover (2) slightly press the main board assembly (3); the two sides of the die-casting bottom cover (2) are provided with first wave absorbing plates (6), the first wave absorbing plates (6) are fixedly arranged at the top of the labyrinth structure, the two inner sides of the die-casting shell seat (1) are provided with sawtooth structures, and electromagnetic waves are reflected to the first wave absorbing plates (6) through the sawtooth structures to be absorbed; the middle part of the die-casting bottom cover (2) is provided with a second wave absorbing plate (7), the middle part of the die-casting shell seat (1) is provided with a third wave absorbing plate (8), and the second wave absorbing plate (7) and the third wave absorbing plate (8) press the jumper wire on the optical port part in the middle part of the mainboard assembly (3).
2. The novel electromagnetically shielded optical module housing structure as claimed in claim 1, wherein said main board assembly (3) comprises an MT ferrule (301), an MT jumper (302) and a PCB board (303), wherein: the MT insertion core (301) is fixed through the front ends of the die-casting shell seat (1) and the die-casting bottom cover (2); the MT jumper (302) is fixed through the middle parts of the die-casting shell seat (1) and the die-casting bottom cover (2); the tail part of the PCB (303) is fixed through the tail parts of the die-casting shell seat (1) and the die-casting bottom cover (2).
3. The novel electromagnetic shielding optical module housing structure according to claim 2, wherein in the optical port portion in the middle of the motherboard assembly (3), the MT jumper (302) is pressed between the second wave absorbing plate (7) and the third wave absorbing plate (8), electromagnetic waves radiated by the MT jumper (302) are absorbed by the second wave absorbing plate (7) and the third wave absorbing plate (8), and a gap in the optical port portion is blocked; the front end (401) of the optical port fixes one side of the MT insertion core (301) through a labyrinth structure and increases the radiation distance of electromagnetic waves; the rear end (402) of the light opening is matched and fixed with the die-casting shell seat (1) through a first shielding glue (4) on the die-casting bottom cover (2).
4. A novel electromagnetic shielding optical module housing structure according to claim 3, wherein the first shielding glue (4) on the die-cast bottom cover (2) is pressed on the other side of the MT ferrule (301) to seal the gap between the MT ferrule (301) and the die-cast bottom cover (2) and reduce the electromagnetic wave radiation gap.
5. The novel electromagnetic shielding optical module housing structure of claim 3, wherein the sealing structure of the optical port portion is a trapezoid structure, the MT jumper (302) is located at a shorter side of the trapezoid, both sides of the MT jumper (302) are sides of the trapezoid, and one side of the die-cast bottom cover (2) is a longer side of the trapezoid.
6. The novel electromagnetically shielded optical module housing structure as claimed in claim 5, wherein said trapezoid structure is sealed by a first shielding glue (4).
7. A novel electromagnetic shielding optical module housing structure according to claim 2, wherein the middle position of the optical module tail is lightly pressed on the tail of the PCB (303) by the second shielding glue (5) on the die-cast housing base (1) and the first shielding glue (4) on the die-cast bottom cover (2) for blocking the gap of the optical module tail and preventing the electromagnetic wave from radiating from the gap.
8. The novel electromagnetic shielding optical module housing structure of claim 1, wherein the labyrinth structure comprises housing boss (501) and housing boss serrations (502) on the die-cast housing base (1), and bottom cover groove (503) on the die-cast bottom cover (2); the shell base boss (501) and the bottom cover groove (503) are embedded and occluded and sealed, the top of the shell base boss (501) is adhered to the bottom cover groove (503) through first shielding glue (4), and a first gap (504) is formed between the shell base boss (501) and the bottom cover groove (503); the shell seat sawteeth (502) are arranged at the bottom of the shell seat boss (501), the first wave absorbing plate (6) is arranged on the die-casting bottom cover (2) and located at the side of the bottom cover groove (503), a second gap (505) is formed between the first wave absorbing plate (6) and the shell seat sawteeth (502), and electromagnetic waves (506) are continuously reflected in the first gap (504) and the second gap (505) through the shell seat sawteeth (502) until the electromagnetic waves are absorbed by the first wave absorbing plate (6) and converted into heat energy.
9. The novel electro-magnetic shielding optical module housing structure of claim 8, wherein the included angle of the saw teeth of the housing base saw teeth (502) is 30-60 degrees.
10. The housing structure of claim 1, wherein the height of the conical protrusion is 0.2mm, the diameter of the bottom dimension is 0.55mm, and the gap between the conical protrusions is 1.22mm, which can block electromagnetic waves with specific wavelength from directly radiating out.
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| CN113419314B (en) | 2022-03-18 |
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