CN205657906U

CN205657906U - Circuit board convenient to detect back drilling degree of depth

Info

Publication number: CN205657906U
Application number: CN201620268176.XU
Authority: CN
Inventors: 腾飞; 任小浪; 陈蓓
Original assignee: Guangzhou Xingsen Electronic Co ltd; Shenzhen Fastprint Circuit Tech Co Ltd; Guangzhou Fastprint Circuit Technology Co Ltd
Current assignee: Guangzhou Xingsen Electronic Co ltd; Shenzhen Fastprint Circuit Tech Co Ltd; Guangzhou Fastprint Circuit Technology Co Ltd
Priority date: 2016-03-31
Filing date: 2016-03-31
Publication date: 2016-10-19
Anticipated expiration: 2026-03-31

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

A kind of wiring board being easy to detect the back drill degree of depth

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

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.