CN205847731U - A kind of coaxial-type optical assembly - Google Patents
A kind of coaxial-type optical assembly Download PDFInfo
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- CN205847731U CN205847731U CN201620659991.9U CN201620659991U CN205847731U CN 205847731 U CN205847731 U CN 205847731U CN 201620659991 U CN201620659991 U CN 201620659991U CN 205847731 U CN205847731 U CN 205847731U
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- coaxial
- optical assembly
- high speed
- type optical
- stiffening plate
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Abstract
This utility model provides a kind of coaxial-type optical assembly, including: flexible PCB, coaxial component base, coaxial component high speed pin and ground attribute pad；Wherein, flexible PCB includes: aluminum matter stiffening plate, top line and wiring underlayer；Flexible PCB bends at downward place, coaxial component base center；Aluminum matter stiffening plate is attached on described coaxial component base, fixing after flexible PCB bending shapes；Coaxial component high speed pin respectively with top line, the pad solder of wiring underlayer one end；Ground attribute pad is placed in around described coaxial component high speed pin, forms planar waveguiding structure with coaxial component high speed pin.The coaxial-type optical assembly that this utility model provides overcomes the stub effect that conventional coaxial optical assembly FPC brings, expand the radio frequency bandwidth of coaxial optical, the signal rate transmission of higher rate can be realized under the optical assembly of same process coaxial packaging form, saved packaging cost.
Description
Technical field
This utility model belongs to photoelectric subassembly encapsulation technology field, is more particularly to a kind of high speed coaxial-type optical assembly.
Background technology
Flexible PCB (Flexible Printed Circuit Board, FPC) is based on passing through print on flexible parent metal
The flexible print circuit that brush circuit technology is made, can carry out free bend, folding, especially according to actual installation requirements
It is applicable to the Space configuration of three-dimensional, there is the highest Installation Flexibility.FPC uses extensively at photovoltaic industry, mainly applies to light
Connection between electricity assembly and hard circuit board, the respective outer side edges for optical module provides higher Installation Flexibility.
As shown in Figure 1A, for the schematic diagram of photoelectricity coaxial optical assembly FPC structure in conventional art.Through at the bottom of coaxial component
The device pin 105 of seat 102 is connected to the copper lines 104 of FPC by soldering, after having welded, inevitably exists
Coaxial component residual pin 103 part.As shown in Figure 1B, show for the side-looking of photoelectricity coaxial optical assembly FPC structure in conventional art
It is intended to.Coaxial component residual pin 103 part is limited to welding procedure, and its remaining lengths is typically at about 1mm, and coaxial component is residual
The existence staying pin 103 can be greatly increased the distributed inductance of signal line, causes signal cracking, affects the radio frequency band of whole link
Width, reduces the performance of whole photoelectric subassembly.
Being different from traditional FPC design, the FPC that optical assembly welding uses not only needs good bending and reliability,
The more important thing is the transmission of this kind of FPC carrying high speed signal, its design needs to reach good signal integrity sex expression.Traditional
Coaxial-type optical assembly FPC is designed with through hole installation form, and it is not optimum that the signal of this design flows to, simultaneously because welding
The residue problem of pin, easily causes stub effect, have impact on the radio frequency bandwidth performance that photoelectric subassembly encapsulation is overall.
Utility model content
The stub effect being conventional coaxial optical assembly FPC and bringing to be solved in the utility model, and then affect photoelectric subassembly
The technical problem of the radio frequency bandwidth that encapsulation is overall.
In order to solve above-mentioned technical problem, this utility model provides a kind of coaxial-type optical assembly, including:
Flexible PCB, coaxial component base, coaxial component high speed pin and ground attribute pad；Wherein, described flexibility
Circuit board includes:
Aluminum matter stiffening plate, top line and wiring underlayer；
Described flexible PCB bends at downward place, described coaxial component base center；
Described aluminum matter stiffening plate is attached on described coaxial component base, consolidating after the bending of described flexible PCB shapes
Fixed；
Described coaxial component high speed pin respectively with described top line, the pad solder of described wiring underlayer one end；
Described ground attribute pad is placed in around described coaxial component high speed pin, is formed with described coaxial component high speed pin
Planar waveguiding structure.
Preferably, described top line and described wiring underlayer are rolled copper foil.
Preferably, the thickness of described rolled copper foil is 18um.
Preferably, described flexible circuit also includes:
Top layer coverlay, bottom coverlay and LCP base material；
Described wiring underlayer is attached on described LCP base material, and described top line is attached to the top layer of LCP base material；
The thickness of described bottom coverlay is 25um, and one end of described bottom coverlay is connected with described aluminum matter stiffening plate,
Prevent described wiring underlayer from aoxidizing；The thickness of described top layer coverlay is 25um, and described top layer coverlay is bonded in described top layer
Circuit upper strata, prevents described top line from aoxidizing.
Preferably, the bottom surface portions region of described aluminum matter stiffening plate and side are by carrying out anodization, exhausted with the external world
Edge.
Preferably, the end face of described aluminum matter stiffening plate does not carry out anodization, by conducting resinl and described copper lines
It is connected；Subregion bottom described aluminum matter stiffening plate does not carry out anodization, at the bottom of conducting resinl and described coaxial component
Seat is connected, and forms high speed signal contact return flow path.
Preferably, the thickness of described aluminum matter stiffening plate is 0.15mm.
Preferably, described coaxial component high speed pin and described coaxial component base are made up of glass medium.
This utility model provides a kind of coaxial-type optical assembly, overcomes the stub effect that conventional coaxial optical assembly FPC brings
Should, the welding manner of FPC and coaxial optoelectronic component uses the surface mount formats of direct-insert, and microstrip line end welds with coaxial module
The pad structure connect uses coplanar waveguide form, it is achieved that microstrip line, to the smooth and easy transition of coaxial pin transmission form, is expanded
The radio frequency bandwidth of coaxial optical, can realize the signal speed of higher rate under the optical assembly of same process coaxial packaging form
Rate is transmitted, and has saved packaging cost.Use aluminium flake reinforcement simultaneously, the formability thereof of soft board can be strengthened, it is allowed to the later stage passes through fixture
Once bend shaping, facilitate follow-up batch machining to produce and welding sequence.
Accompanying drawing explanation
In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, below will be to embodiment
Or the required accompanying drawing used is briefly described in description of the prior art, it should be apparent that, the accompanying drawing in describing below is only
It is embodiments more of the present utility model, for those of ordinary skill in the art, in the premise not paying creative work
Under, it is also possible to other accompanying drawing is obtained according to these accompanying drawings.
Figure 1A is the schematic diagram of photoelectricity coaxial optical assembly FPC structure in conventional art；
Figure 1B is the schematic side view of photoelectricity coaxial optical assembly FPC structure in conventional art；
The schematic diagram of the photoelectricity coaxial assembly FPC structure that Fig. 2 A provides for this utility model embodiment；
The schematic side view of the photoelectricity coaxial assembly FPC structure that Fig. 2 B provides for this utility model embodiment；
The schematic diagram of the photoelectricity coaxial assembly FPC structural laminate that Fig. 3 provides for this utility model embodiment；
The photoelectricity coaxial assembly FPC that Fig. 4 provides for this utility model embodiment and the photoelectricity coaxial assembly in conventional art
FPC is being suitable for the schematic diagram of identical coaxial component base Time Bandwidth simulation result of calculation contrast；
The photoelectricity coaxial integrally-built schematic diagram of assembly FPC that Fig. 5 provides for this utility model embodiment.
Detailed description of the invention
With embodiment, this utility model is described in further detail below in conjunction with the accompanying drawings.Following example are used for illustrating this
Utility model, but can not be used for limiting scope of the present utility model.
As shown in Fig. 2 A, 2B, the respectively signal of the photoelectricity coaxial assembly FPC structure that this utility model embodiment provides
Figure, schematic side view.This utility model provides a kind of coaxial-type optical assembly, including:
Flexible PCB 201, coaxial component base 202, coaxial component high speed pin 205 and ground attribute pad 203；Its
In, described flexible PCB includes 201:
Aluminum matter stiffening plate, top line and wiring underlayer；
Described flexible PCB 201 bends at downward place, described coaxial component base 202 center；
Described aluminum matter stiffening plate is attached on described coaxial component base 202, shapes for the bending of described flexible PCB 201
After fixing；
Described coaxial component high speed pin 205 respectively with described top line, the pad solder of described wiring underlayer one end；
Described ground attribute pad 203 is placed in around described coaxial component high speed pin 205, with described coaxial component high-velocity tube
Foot 205 forms planar waveguiding structure.Coaxial component high speed pin 205 is directly welded in the pad of copper lines one end terminal, this
Plant welding method and eliminate the stub effect of high speed pin.It is dispersed throughout the ground attribute around coaxial component high speed pin 205 simultaneously
Pad 203, constitutes planar waveguiding structure with coaxial component high speed pin 205, and this structure achieves FPC micro-strip knot swimmingly
Structure copper lines 204 seamlessly transits to coaxial line structure.
Wherein it is preferred to, whole FPC rolls at the downward 0.2mm in center of the coaxial component base 202 of photoelectric subassembly
Curved.
Preferably, described top line and described wiring underlayer are rolled copper foil.Preferably, the thickness of described rolled copper foil
Degree is 18um.
Preferably, described flexible circuit also includes: top layer coverlay, bottom coverlay and LCP base material；Described bottom line
Road is attached on described LCP base material, and described top line is attached to the top layer of LCP base material；The thickness of described bottom coverlay is
25um, one end of described bottom coverlay is connected with described aluminum matter stiffening plate, prevents described wiring underlayer from aoxidizing；Described top layer covers
The thickness of epiphragma is 25um, and described top layer coverlay is bonded in described top line upper strata, prevents described top line from aoxidizing.
Preferably, the bottom surface portions region of described aluminum matter stiffening plate and side are by carrying out anodization, exhausted with the external world
Edge.Preferably, the end face of described aluminum matter stiffening plate does not carry out anodization, by conducting resinl and described copper lines phase
Even；Subregion bottom described aluminum matter stiffening plate does not carry out anodization, by conducting resinl and described coaxial component base
It is connected, forms high speed signal contact return flow path.Preferably, the thickness of described aluminum matter stiffening plate is 0.15mm.It is close to same axial organ
Part base 202 is the aluminum matter stiffening plate of FPC, and the rigidity bending performance of aluminium flake provides the fixation after FPC bending shapes,
Change FPC ground attribute copper sheet with the some link enhancement of coaxial optoelectronic component is that face connects simultaneously, increases signal return flow path area,
Reduce loop inductance value.
Preferably, described coaxial component high speed pin and described coaxial component base are made up of glass medium.
As it is shown on figure 3, the signal of the photoelectricity coaxial assembly FPC structural laminate provided for this utility model embodiment.Wherein,
The FPC structural laminate that this utility model embodiment uses is as follows, and its laminate portion is from top to bottom:
Ground floor is Du Pont's PI coverlay of 25um thickness (containing glue), is used for playing route protection function；The second layer is
The rolled copper foil of 18um thickness, for improving the bending performance of FPC copper lines；Third layer is the Panasonic LCP of 50um thickness
Material, it has good thermoplasticity, is easily bent into required figure, and has certain shape retentivity, simultaneously
It has lower dielectric loss in 0～50GHz scope, it is provided that preferably line signal integrity performance；4th layer is
The rolled copper foil of 18um thickness；Layer 5 is divided into two parts, and Part I is the aluminium flake reinforcement of 0.15mm thickness, and it acts on
The part that FPC is connected with coaxial component base, and extend to below coaxial component high-velocity tube footnote patch region.On the one hand it act on
There is provided sufficient high speed signal ground level to reflux, on the other hand as the shaped portion of later stage fixture bending, overcome soft board soft
The easily weakness of deformation.Latter half is Du Pont's PI coverlay of 25um thickness (containing glue), and it provides protection from for line layer
Copper lines aoxidizes with air contact, improves circuit reliability.
Preferably, the coaxial-type optical assembly that this utility model embodiment provides improves existing traditional coaxial component and uses
FPC structure, had both met FPC by referring to the laminated construction design shown in Fig. 3 and had extended to the Gao Rou of printed circuit board section
Tough bending characteristic, meeting again FPC needs the rigidity forming requirements with coaxial component base engagement front section.Use microstrip line
To the pad structure of waveguide form conversion, both avoided the stub that the residual of device pin causes, achieved again in coaxial module
Portion's more preferably high speed signal feed-in mode, boost device overall package radio frequency bandwidth characteristic.
As shown in Figure 4, the photoelectricity coaxial assembly FPC provided for this utility model embodiment is same with the photoelectricity in conventional art
Shaft assembly FPC is being suitable for the schematic diagram of identical coaxial component base Time Bandwidth simulation result of calculation contrast.Can be seen that dotted line generation
The traditional F PC structure of table, its-three dB bandwidth reading is 31.5GHz.And the FPC attachment structure that this utility model embodiment provides sets
Meter, its-three dB bandwidth is more than 40GHz.Bandwidth statement, dotted portion is the bandwidth before improving, and its reading is 31.5GHz, and solid line is bent
Line is that the band after improving is wider than 40GHz, and frequency response is the most smooth.
As it is shown in figure 5, the photoelectricity coaxial integrally-built schematic diagram of assembly FPC provided for this utility model embodiment.Ginseng
According to Fig. 5, a kind of its overall structure of FPC plate, as shown in 301, comprises aluminum matter stiffening plate 302, bottom coverlay 303, wiring underlayer layer
304, Panasonic's LCP base material 305, top line 306, top layer coverlay 307.
Wherein it is preferred to the thickness of aluminum matter stiffening plate 302 is 0.15mm, the wherein end in aluminum matter stiffening plate 302 front view
Face and side all carry out anodization so that it is have certain insulating properties.The end face of aluminum matter stiffening plate 302 front view does not do sun
Polarization processes, and has electric conductivity, is connected with the bottom Copper Foil of wiring underlayer layer 304 by conducting resinl, forms high speed signal face and connects
Touch return flow path, reduce loop inductance.Simultaneously by the easy shaping characteristic of metal of aluminium flake, it is beneficial to realize this utility model embodiment
Middle FPC molding structure.Coaxial pin is dodged in the middle of aluminum matter stiffening plate 302.Preferably bottom coverlay 303 thickness is 25um, one
End is plugged into aluminum matter stiffening plate 302, and protection wiring underlayer 304 is not oxidized, meets the bending characteristic that FPC back segment is good simultaneously.
Wiring underlayer 304 is attached on Panasonic's LCP base material 305, and Panasonic's LCP base material 305 has good thermoplasticity, can be molded into one
Fixed structure does not rebounds, it may have good bending.Panasonic LCP base material 305 has the lowest dielectric loss simultaneously, can reduce
High speed signal walks the loss of line end at FPC, keeps more preferable envelope eapsulotomy ability.Top line 306 is attached to Panasonic's LCP base material
The top layer of 305, top line 306 impedance control keeps, with coaxial component impedance is consistent, reducing the reflection loss in signal transmission.
Top line 306 electric impedance control line end is coplanar waveguide structure, it is achieved the more preferable transition of pin coaxial with device, high speed signal
Directly burst into coaxial component pin, overcome the stub problem of device pin simultaneously, improve the signal transmission of optical assembly encapsulation
Radio frequency bandwidth.The top layer coverlay 307 of preferably 25um is bonded in top line 306 upper strata, and protection circuit is from ambient atmos
Corrosion and oxidation, reduce short-circuit risks simultaneously.Wiring underlayer 304 and top line 306 use 18um thickness rolled copper foil, its post
Shape crystal structure, can promote line layer bend resistance ability, improves and assembles repeated and flexible for installation degree.
Preferably, FPC overall 301 by fixture bending forming, is suitable for follow-up assembling and Welder by diagram folding line 308
Sequence.The molding stationarity of logical peraluminous stiffening plate 302, this utility model embodiment FPC can preferably be applicable to coaxial component weldering
Connect process operations, it is to avoid traditional F PC is the softest, not easy fitted packing problem.
In sum, a kind of coaxial-type optical assembly that this utility model provides, overcome conventional coaxial optical assembly FPC and bring
Stub effect, the welding manner of FPC and coaxial optoelectronic component uses the surface mount formats of direct-insert, microstrip line end with
The pad structure of shaft assembly welding uses coplanar waveguide form, it is achieved that microstrip line is to the smooth and easy mistake of coaxial pin transmission form
Cross, expanded the radio frequency bandwidth of coaxial optical, can realize under the optical assembly of same process coaxial packaging form more at a high speed
The signal rate transmission of rate, has saved packaging cost.Use aluminium flake reinforcement simultaneously, the formability thereof of soft board can be strengthened, it is allowed to after
Phase once bends shaping by fixture, facilitates follow-up batch machining to produce and welding sequence.
Embodiment of above is merely to illustrate this utility model, rather than to restriction of the present utility model.Although with reference to implementing
This utility model has been described in detail by example, it will be understood by those within the art that, to technology of the present utility model
Scheme carries out various combination, amendment or equivalent, without departure from the spirit and scope of technical solutions of the utility model, and all should
Contain in the middle of right of the present utility model.
Claims (8)
1. a coaxial-type optical assembly, it is characterised in that including:
Flexible PCB, coaxial component base, coaxial component high speed pin and ground attribute pad；Wherein, described flexible circuit
Plate includes:
Aluminum matter stiffening plate, top line and wiring underlayer；
Described flexible PCB bends at downward place, described coaxial component base center；
Described aluminum matter stiffening plate is attached on described coaxial component base, fixing after the bending of described flexible PCB shapes；
Described coaxial component high speed pin respectively with described top line, the pad solder of described wiring underlayer one end；
Described ground attribute pad is placed in around described coaxial component high speed pin, forms plane with described coaxial component high speed pin
Waveguiding structure.
Coaxial-type optical assembly the most according to claim 1, it is characterised in that described top line and described wiring underlayer
For rolled copper foil.
Coaxial-type optical assembly the most according to claim 2, it is characterised in that the thickness of described rolled copper foil is 18um.
Coaxial-type optical assembly the most according to claim 2, it is characterised in that described flexible circuit also includes:
Top layer coverlay, bottom coverlay and LCP base material；
Described wiring underlayer is attached on described LCP base material, and described top line is attached to the top layer of LCP base material；
The thickness of described bottom coverlay is 25um, and one end of described bottom coverlay is connected with described aluminum matter stiffening plate, prevents
Described wiring underlayer aoxidizes；The thickness of described top layer coverlay is 25um, and described top layer coverlay is bonded in described top line
Upper strata, prevents described top line from aoxidizing.
Coaxial-type optical assembly the most according to claim 2, it is characterised in that the bottom surface portions region of described aluminum matter stiffening plate
With side by carrying out anodization, with external insulation.
Coaxial-type optical assembly the most according to claim 2, it is characterised in that the end face of described aluminum matter stiffening plate does not carry out sun
Polarization processes, and is connected with described copper lines by conducting resinl；Subregion bottom described aluminum matter stiffening plate does not carry out anode
Change processes, and is connected with described coaxial component base by conducting resinl, forms high speed signal contact return flow path.
7. according to the coaxial-type optical assembly described in any one of claim 1-6, it is characterised in that the thickness of described aluminum matter stiffening plate
For 0.15mm.
8. according to the coaxial-type optical assembly described in any one of claim 1-6, it is characterised in that described coaxial component high speed pin
And described coaxial component base is made up of glass medium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620659991.9U CN205847731U (en) | 2016-06-28 | 2016-06-28 | A kind of coaxial-type optical assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620659991.9U CN205847731U (en) | 2016-06-28 | 2016-06-28 | A kind of coaxial-type optical assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205847731U true CN205847731U (en) | 2016-12-28 |
Family
ID=57621474
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620659991.9U Active CN205847731U (en) | 2016-06-28 | 2016-06-28 | A kind of coaxial-type optical assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205847731U (en) |
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2016
- 2016-06-28 CN CN201620659991.9U patent/CN205847731U/en active Active
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