CN205657906U - Circuit board convenient to detect back drilling degree of depth - Google Patents
Circuit board convenient to detect back drilling degree of depth Download PDFInfo
- Publication number
- CN205657906U CN205657906U CN201620268176.XU CN201620268176U CN205657906U CN 205657906 U CN205657906 U CN 205657906U CN 201620268176 U CN201620268176 U CN 201620268176U CN 205657906 U CN205657906 U CN 205657906U
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- hole
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- depth
- back drilling
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Abstract
The utility model discloses a circuit board convenient to detect back drilling degree of depth has the one or more through -hole on the circuit board, it is regional to have the back drilling who drills out the back drilling hole on this through -hole outlying circuit board, and the circuit board has an each other spaced copper layer of M along the bore depth orientation of through -hole, be equipped with a marker and the 2nd marker that can be discerned by the X ray on the N copper layer in the through -hole outside and the N+1 copper layer respectively, a marker lies in the back drilling hole in the projection on a N copper layer, and the 2nd marker lies in the back drilling hole at the projection on a N+1 copper layer, wherein N+1< M. It can be by the ring pad and the square pad of X ray discernment to be equipped with on the copper layer through the through -hole the needing back drilling outside, and back drilling accomplishes the back, and the accessible uses the X ray printing opacity to observe whether a N copper layer exists square pad and whether a N+1 copper layer exists the ring pad is next judges directly whether qualified the back drilling hole is, has simplified the detection procedures in back drilling hole greatly.
Description
Technical field
This utility model relates to a kind of wiring board being easy to detect the back drill degree of depth.
Background technology
In the manufacture process of wiring board, need through hole to realize being electrically connected of inner layer circuit board interlayer
Connecing, through hole is generally drilled with by rig, and its requirement on machining accuracy is higher, utilizes rig to get out logical
Kong Houjing sink copper plating, in through-holes formed conductive layer thus realize electrical connection.But, some
The end of electroplated through hole is without connecting, and this will cause turning back of signal, resonance also can alleviate,
Can cause reflection that signal transmits, scatter, delay etc., asking of " distortion " can be brought to signal
Topic.This is accomplished by being processed further through hole, i.e. back drill.The effect of back drill is to bore to fall not rise
Through hole section to any connection or transmitting effect, it is to avoid cause reflection that signal transmits, scattering,
Postpone, to " distortion " of signal band rice, therefore the general through hole to consent non-on wiring board
Back drill will be carried out.
Back drill is extremely important for the transmission of signal, but due to processing request and required precision relatively
Height, is easy to leakage and bores, be also easy to not meet use because the back drill degree of depth is the most shallow in operating process
Requirement, or monoblock circuit board is scrapped, so completing at back drill because the back drill degree of depth is too deep
After need the back drill degree of depth is detected, inspection back drill hole the back drill degree of depth whether meet the requirements,
And the method detecting back drill hole depth at present is mainly by artificial the circuit board level specified
Make section measure and judge.
The mode using above-mentioned section there is problems in that needs make a large amount of section, and section needs
Manually cut, processing cost is high, spends the time long, wastes substantial amounts of time cost, and
By making section, circuit board can be destroyed, operate more complicated, the most still
Needing to wait for testing result, detection efficiency is low.
Utility model content
The problem existed for prior art, one of the purpose of this utility model is to provide one
It is easy to detect the wiring board of the back drill degree of depth, it is simple to the detection of the back drill degree of depth.
For achieving the above object, this utility model adopts the following technical scheme that
A kind of wiring board being easy to detect the back drill degree of depth, wiring board has one or more logical
Hole, the wiring board that this through hole is peripheral has the back drill region getting out back drill hole, and wiring board is along logical
The hole depth direction in hole has M spaced layers of copper, the n-th layers of copper outside described through hole
Can be by the first marker of X-ray identification and the second mark with being respectively equipped with in the N+1 layers of copper
Thing, the first marker is positioned at the projection in n-th layers of copper of the back drill hole, and the second marker is positioned at
Back drill hole in the projection of N+1 layers of copper, wherein N+1 < M.
Preferably, described first marker is square pads, and described second marker is annulus weldering
Dish.
Preferably, described square pads with the center of circle of through hole as geometric center, described square pads
The shortest length in Edge Distance back drill hole is more than 3mil, and described annulus pad is with the circle in back drill hole
Centered by the heart, the diameter in back drill hole is more than 3mil with the difference of pad external diameter.
Preferably, the outside dimension of described annulus pad is less than the length of square pads minor face length
Degree.
Compared to prior art, the beneficial effects of the utility model are: provide a kind of wiring board,
The layers of copper needing outside the through hole of back drill is provided with can by the square pads of X-ray identification and
Annulus pad, after back drill completes, can be by whether using X-ray translumination observation n-th layers of copper
There is square pads and whether the N+1 layers of copper exists annulus pad and directly judge back drill hole
The most qualified, enormously simplify the detecting step in back drill hole, meanwhile, limit square pads and circle
The size of boxing dish so that the detection in follow-up back drill hole is more accurate.
Accompanying drawing explanation
Fig. 1 is a kind of sectional view being easy to detect the wiring board of the back drill degree of depth of this utility model;
Fig. 2 is this utility model through hole, back drill hole and the pad top view relative to position;
Fig. 3 is this utility model through hole, back drill hole and the Q-RING top view relative to position.
Wherein, 10, through hole;20, back drill hole;30, n-th layers of copper;40, N+1
Layers of copper;50, the first marker;501, annulus pad;60, the second marker;601, side
Shape pad.
Detailed description of the invention
Below, in conjunction with accompanying drawing and detailed description of the invention, this utility model is described further:
As it is shown in figure 1, a kind of wiring board being easy to detect the back drill degree of depth, wiring board has one
Individual or multiple through holes 10, the wiring board of this through hole 10 periphery have and get out back drill hole 20
Back drill region, wiring board has M spaced layers of copper along the hole depth direction of through hole 10,
Being respectively equipped with in n-th layers of copper 30 outside described through hole 10 and the N+1 layers of copper 40 can
By the first marker 50 and the second marker 60 of X-ray identification, the first marker 50
In back drill hole 20 in the projection of n-th layers of copper 30, the second marker 60 is positioned at back drill hole
20 in the projection of the N+1 layers of copper 40, wherein N+1 < M.
By being correspondingly provided with respectively can be penetrated by X in n-th layers of copper 30 and the N+1 layers of copper 40
First marker 50 and the second marker 60 of line identification, after back drill completes, saturating by X
Light is observed, can be according to whether having the first marker 50 and the second mark in the layers of copper of wiring board
Thing 60 directly judges that the back drill degree of depth is the most qualified, enormously simplify the inspection of the follow-up back drill degree of depth
Survey step so that the detection of the back drill degree of depth becomes simple;Need exist for special instruction, the back of the body
The back drill of boring 20 requires: back drill hole 20, through n-th layers of copper 30, is not passed through N+1
Individual layers of copper 40.
So that the first marker 50 and the second marker 60 display clearer, more
Being beneficial to the detection of the back drill degree of depth, described first marker 50 is square pads 601, described the
Two markers 60 are annulus pad 501.During follow-up back drill depth detection, can lead to
Cross and directly detect whether there is square pads in n-th layers of copper 30 and the N+1 layers of copper 40
601 and annulus pad 501 directly judge that back drill hole 20 is the most qualified.
For ensureing the precision of the back drill hole 20 back drill degree of depth, required detected back drill hole 20 is
Back drill is carried out by flat drill, therefore to prevent flat drill boring off normal, described
Square pads 601 with the center of circle of through hole 10 as geometric center, described square pads 601 edge
The shortest length in distance back drill hole 20 is more than 3mil, and described annulus pad 501 is with back drill hole 20
The center of circle centered by, the diameter in back drill hole 20 is more than with the difference of annulus pad 501 external diameter
3mil, it is ensured that square pads 601 and annulus pad 501 are separated by necessarily with back drill hole 20 circumference
Distance, so, even if flat drill produces off normal because of precision or external force, during back drill,
As long as flat drill passes n-th layers of copper 30, square pads 601 can thoroughly be bored, only
Drill is wanted thoroughly to be bored through the N+1 layers of copper 40, annulus pad 501, Bu Huiyin
Affect last testing result for boring off normal, add the accuracy of testing result.
In order to prevent when using X-ray detection back drill hole 20 degree of depth, annulus pad 501 with
Square pads 601 occurs that overlap is difficult to differentiate between and affects last testing result, and described annulus welds
The outside dimension of dish 501 is less than the length of square pads 601 minor face length, and so, annulus welds
Dish 501 is positioned at the square pads 601 projection the N+1 layers of copper 40, is further ensured that
The accuracy of detection.
It will be apparent to those skilled in the art that can technical scheme as described above and structure
Think, make other various corresponding changes and deformation, and all these changes and deformation
Within all should belonging to this utility model scope of the claims.
Claims (4)
1. it is easy to detect a wiring board for the back drill degree of depth, this wiring board has one or many
Individual through hole, the wiring board that this through hole is peripheral has the back drill region getting out back drill hole, wiring board
Hole depth direction along through hole has M spaced layers of copper, it is characterised in that described through hole
Being respectively equipped with in the n-th layers of copper in outside and the N+1 layers of copper can be by the first of X-ray identification
Marker and the second marker, the first marker is positioned at the projection in n-th layers of copper of the back drill hole
In, the second marker is positioned at the projection N+1 layers of copper of the back drill hole, wherein N+1 < M.
The wiring board being easy to detect the back drill degree of depth the most according to claim 1, its feature
Being, described first marker is square pads, and described second marker is annulus pad.
The wiring board being easy to detect the back drill degree of depth the most according to claim 2, its feature
Be, described square pads with the center of circle of through hole as geometric center, described square pads edge away from
Shortest length from back drill hole is more than 3mil, during described annulus pad with the center of circle in back drill hole is
The heart, the diameter in back drill hole is more than 3mil with the difference of pad external diameter.
The wiring board being easy to detect the back drill degree of depth the most according to claim 2, its feature
Being, the outside dimension of described annulus pad is less than the length of square pads minor face length.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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CN201620268176.XU CN205657906U (en) | 2016-03-31 | 2016-03-31 | Circuit board convenient to detect back drilling degree of depth |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201620268176.XU CN205657906U (en) | 2016-03-31 | 2016-03-31 | Circuit board convenient to detect back drilling degree of depth |
Publications (1)
Publication Number | Publication Date |
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CN205657906U true CN205657906U (en) | 2016-10-19 |
Family
ID=57389707
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CN201620268176.XU Active CN205657906U (en) | 2016-03-31 | 2016-03-31 | Circuit board convenient to detect back drilling degree of depth |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108990294A (en) * | 2018-08-30 | 2018-12-11 | 胜宏科技(惠州)股份有限公司 | A method of avoid the hole NPTH from leaking back drill |
CN113218294A (en) * | 2021-04-07 | 2021-08-06 | 奥士康科技股份有限公司 | Depth and alignment precision detection coupon for back drilling |
CN114413808A (en) * | 2021-12-20 | 2022-04-29 | 深圳市大族数控科技股份有限公司 | Circuit board back drilling hole precision detection method and circuit board |
-
2016
- 2016-03-31 CN CN201620268176.XU patent/CN205657906U/en active Active
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108990294A (en) * | 2018-08-30 | 2018-12-11 | 胜宏科技(惠州)股份有限公司 | A method of avoid the hole NPTH from leaking back drill |
CN108990294B (en) * | 2018-08-30 | 2021-10-15 | 胜宏科技(惠州)股份有限公司 | Method for preventing back drilling of NPTH hole from leaking |
CN113218294A (en) * | 2021-04-07 | 2021-08-06 | 奥士康科技股份有限公司 | Depth and alignment precision detection coupon for back drilling |
CN114413808A (en) * | 2021-12-20 | 2022-04-29 | 深圳市大族数控科技股份有限公司 | Circuit board back drilling hole precision detection method and circuit board |
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