CN108957291A - A kind of detection method of PCB leakproof lettering symbol - Google Patents
A kind of detection method of PCB leakproof lettering symbol Download PDFInfo
- Publication number
- CN108957291A CN108957291A CN201810746465.XA CN201810746465A CN108957291A CN 108957291 A CN108957291 A CN 108957291A CN 201810746465 A CN201810746465 A CN 201810746465A CN 108957291 A CN108957291 A CN 108957291A
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- Prior art keywords
- pad
- windowing
- character
- leakproof
- pcb
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2801—Testing of printed circuits, backplanes, motherboards, hybrid circuits or carriers for multichip packages [MCP]
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2801—Testing of printed circuits, backplanes, motherboards, hybrid circuits or carriers for multichip packages [MCP]
- G01R31/281—Specific types of tests or tests for a specific type of fault, e.g. thermal mapping, shorts testing
- G01R31/2812—Checking for open circuits or shorts, e.g. solder bridges; Testing conductivity, resistivity or impedance
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- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Printing Methods (AREA)
Abstract
The detection method of of the invention and a kind of PCB leakproof lettering symbol, the following steps are included: step 1: assist side is done before solder mask layer, multiple PAD detection units are arranged in the logicalnot circuit region of the line layer of assist side, and PAD detection unit includes at least two pads connected by conducting wire；Step 2: being arranged windowing on the pad of PAD detection unit in welding resistance oil coating procedure, the lateral surface for the corresponding pad that opens a window makes windowing form groove lower than the lateral surface of solder mask layer；Step 3: conducting medium is filled in the windowing of pad and guarantees the outer surface of conducting medium and the flush with outer surface of solder mask layer；Step 4: design character, to guarantee character covering windowing；Step 5: carrying out electrical testing to PAD detection unit, if not admittance when test, shows that character is not bitten；If being connected when test, illustrate that character is bitten.Mitigation personnel pressure and production cost carry out identification using automation equipment and carry out leakproof.
Description
Technical field
The detection method of the present invention and PCB processing technique field more particularly to a kind of PCB leakproof lettering symbol.
Background technique
PCB, full name PrintedCircuitBoard, Chinese are printed wiring board or printed circuit board, hereinafter referred to as line
Road plate；Wiring board is the carrier of electronic component.Wiring board generally include one layer or more line layer and for realizing line layer it
Between the substrate layer that insulate, wiring board is also covered with solder mask layer on the line layer of outer layer, and solder mask layer is the guarantor of outer layer insulation
Sheath, tin on route when playing the role of protection circuit and preventing soldering part.Under normal conditions, it needs to print word on wiring board
It accords with to identify position and the pin of relative electronic components, for guaranteeing the accuracy and subsequent repair of element installation.No matter
It is machine printing or manually uses silk-screen printing, is all easy the presence of phenomena such as biting, lacking print.In recent years planar bar code technology plus
Enter, many clients require character block print in the circuit board, to be used to make laser carving two dimensional code；Since laser carving two dimensional code is to word
The requirement for according with thickness is relatively high, and thickness will be different, therefore need to carry out secondary text printout production under normal conditions.No matter
It is one-step print text or secondary printing, in the premise for the quality for guaranteeing printing, we need to carry out multiple artificial visual
It checks, this is that widespread practice can have the following problems since use manually visualizes inspection in the industry:
1) artificial visual working efficiency is low, and examination board personnel demand amount is big, influences company's production capacity and benefit；
2) visual inspection is easy fatigue, is easy to cause missing missing inspection；
3) in the usual assist side of the character block of secondary printing, area is generally in 10mm2Left and right, very little, Manual Visual Inspection is very
Difficulty finds position, increases examination board difficulty and workload.
Summary of the invention
Technical problem to be solved by the invention is to provide it is a kind of facilitate operation and detection accuracy it is high PCB leakproof lettering symbol
Detection method.
In order to solve the above technical problems, the technical scheme is that a kind of detection method of PCB leakproof lettering symbol, packet
Include following steps:
Step 1: setting PAD detection unit, before assist side does solder mask layer, the line layer of assist side it is non-thread
Multiple PAD detection units are arranged in road region, and PAD detection unit includes at least two pads connected by conducting wire；
Step 2: pad setting opens a window, and windowing is arranged in welding resistance oil coating procedure on the pad of PAD detection unit, opens
The area of window is greater than the area of pad and windowing is in the middle part of pad, and the PAD detection unit other than windowing is by solder resist
The lateral surface of pad corresponding to covering and windowing makes windowing form groove lower than the lateral surface of solder mask layer；
Step 3: filled in the windowing of pad conducting medium and guarantee conducting medium outer surface and solder mask layer it is outer
Flush；
Step 4: design character, to guarantee character covering windowing；
Step 5: carrying out electrical testing to PAD detection unit, if not admittance when test, is in open-circuit condition, then shows character
Do not bite；If being connected when test, it is in short-circuit condition, then illustrates that character is bitten.
The conducting medium in step 3 is conducting resinl as a preferred technical solution, is infused by brush coating network control conducting resinl
Enter in windowing, mesh is arranged in brush coating on the net, and the shape of mesh is identical as the shape of wiring board uplifting window.
The conducting medium in step 3 is conductive tape, the thickness and welding resistance of conductive tape as a preferred technical solution,
The thickness of oxidant layer is identical and the area of conductive tape is greater than the area of PAD detection unit, and conductive tape is equipped with and windowing shape
Identical several point off formula tear lines.
PAD detection unit includes three pads as a preferred technical solution, and three pads are successively electrically connected by conducting wire
It connects；It include two secondary design characters in step 4, when the first secondary design character, with a character point bigger than the windowing of pad by the
The copper of the windowing of one end covers, and aside adds the first mark；When the second secondary design character, with a windowing than pad
Big character point covers the copper of the windowing of the second end, and aside adds the second mark；Wherein, the first mark and the second mark
Show difference.
The first mark and the second mark are Arabic numerals as a preferred technical solution,.
First it is denoted as " 1 " as a preferred technical solution,；.Second is denoted as " 2 ".
Not element in the technique edges or unit of PAD detection unit setting assist side as a preferred technical solution,
Position.
It is 40mil that pad, which is round and pad outer diameter, as a preferred technical solution, is opened a window as the circle concentric with pad
Shape and the outer diameter of windowing are 43mil.
The outer diameter of character block is greater than or equal to 48mil as a preferred technical solution,.
By adopting the above-described technical solution, the detection method of PCB leakproof lettering symbol improves the defect of the prior art, subtract
While light personnel's pressure and production cost, identification is carried out using automation equipment and carries out leakproof, 100% ground of energy will be defective
Wiring board is intercepted in production line, prevents the defect plate for biting character from flowing in client's hand, promotes brand names image.Wherein, exist
Additional increase conducting medium in the windowing of pad, so that the flatness at character design position is high, character printing is clear, more favorably
In the production of laser carving two dimensional code.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention without any creative labor, may be used also for those of ordinary skill in the art
To obtain other drawings based on these drawings.
Fig. 1 is detection principle diagram of the invention；
Fig. 2 is the structural schematic diagram of the embodiment of the present invention；
Fig. 3 is the top view of Fig. 2；
Application principle when Fig. 4 is character design of the present invention applied to laser carving two dimension code type.
Specific embodiment
A kind of detection method of PCB leakproof lettering symbol, comprising the following steps:
Step 1: setting PAD detection unit, before assist side does solder mask layer, the line layer of assist side it is non-thread
Multiple PAD detection units are arranged in road region, and PAD detection unit includes at least two pads connected by conducting wire；
Step 2: pad setting opens a window, and windowing is arranged in welding resistance oil coating procedure on the pad of PAD detection unit, opens
The area of window is greater than the area of pad and windowing is in the middle part of pad, and the PAD detection unit other than windowing is by solder resist
The lateral surface of pad corresponding to covering and windowing makes windowing form groove lower than the lateral surface of solder mask layer；
Step 3: filled in the windowing of pad conducting medium and guarantee conducting medium outer surface and solder mask layer it is outer
Flush；
Step 4: design character, to guarantee character covering windowing；
Step 5: carrying out electrical testing to PAD detection unit, if not admittance when test, is in open-circuit condition, then shows character
Do not bite；If being connected when test, it is in short-circuit condition, then illustrates that character is bitten.
As shown in Figure 1, the conducting wire 2 that PAD detection unit includes at least two pads 1 and connects two pads 1.Such as Fig. 2
With pad 1 and conducting wire 2 shown in Fig. 3, are set on the line layer 6 of assist side, open a window in 3 coating processes of solder mask layer in pad 1,
The area of windowing is greater than the area of pad.Before designing character 5, since conducting wire 2, solder resist will be completely covered in solder mask layer 3
Layer 3 protrudes from pad 1, therefore concave point is formed at windowing, is easy to cause 5 clarity of character to be affected when designing character, in order to
Guarantee the clarity of character 5, it is also necessary to conducting medium 4 is filled in windowing, conducting medium 4 is on the one hand to guarantee character 5
The flatness in design face, while also needing to guarantee well that it can be electrically connected detection device and pad 1, so that character when detection
5 bite, then circuit is in short-circuit condition, and character 5 can just show open-circuit condition without biting.
Wherein, conductive tape can also be used using conducting resinl in the conducting medium 4 in step 3, when using conducting resinl
When, by the way that in the injection windowing of brush coating network control conducting resinl, mesh, shape and the wiring board uplifting window of mesh is arranged in brush coating on the net
Shape is identical；When using conductive tape, the thickness of conductive tape is identical as the thickness of solder mask layer 3 and the area of conductive tape
Greater than the area of PAD detection unit, conductive tape is equipped with several point off formula tear lines identical with windowing shape.
It needs to print twice when implementing laser carving planar bar code technology to wiring board, in order to avoid biting, PAD detection unit is set
At least three pads are set, three pads are sequentially connected electrically by conducting wire；As shown in figure 3, laser carving two dimensional code includes two secondary design words
Symbol when the first secondary design character, is covered the copper of the windowing of first end 8 with a character point bigger than the windowing of pad,
And aside add the first mark 7；When the second secondary design character, with a big character point of windowing than pad by the second end 9
The copper of windowing cover, and aside plus the second mark 10；Wherein, the first mark 9 and 10 difference of the second mark are used to distinguish
It prints twice, convenient for determining the technique bitten when detection.Arabic numerals can be used in first mark 7 and the second mark 10, convenient
Distinguishing mark, for example, first is denoted as " 1 "；.Second is denoted as " 2 ".
In the detection method of PCB leakproof lettering symbol, PAD detection unit is arranged non-in the technique edges or unit of assist side
The position of element.Pad is that round and pad outer diameter is 40mil；It opens a window and is for the outer diameter of the circle concentric with pad and windowing
43mil；The outer diameter of character block is greater than or equal to 48mil.
The present invention mentions compared with prior art, high-efficient, is directly detected in electrical testing, without manually being examined
It looks into, improves production efficiency.Meanwhile optimizing production procedure, the labor intensity of manual inspection is reduced, quality guarantee is also achieved,
It is detected due to using test machine, nothing bites the generation for causing missing inspection problem.
The above shows and describes the basic principle, main features and advantages of the invention.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (9)
1. a kind of detection method of PCB leakproof lettering symbol, it is characterised in that: the following steps are included:
Step 1: setting PAD detection unit, before assist side does solder mask layer, the logicalnot circuit area of the line layer of assist side
Multiple PAD detection units are arranged in domain, and PAD detection unit includes at least two pads connected by conducting wire；
Step 2: pad setting opens a window, and windowing is arranged in welding resistance oil coating procedure on the pad of PAD detection unit, windowing
Area is greater than the area of pad and windowing is in the middle part of pad, and the PAD detection unit other than windowing is covered by solder resist
And the lateral surface of pad corresponding to windowing makes windowing form groove lower than the lateral surface of solder mask layer；
Step 3: conducting medium is filled in the windowing of pad and guarantees the outer surface of conducting medium and the outer surface of solder mask layer
Concordantly；
Step 4: design character, to guarantee character covering windowing；
Step 5: carrying out electrical testing to PAD detection unit, if not admittance when test, is in open-circuit condition, then shows that character does not have
It bites；If being connected when test, it is in short-circuit condition, then illustrates that character is bitten.
2. a kind of detection method of PCB leakproof lettering symbol as described in claim 1, it is characterised in that: the conduction in step 3
Medium is conducting resinl, by the way that in the injection windowing of brush coating network control conducting resinl, mesh, the shape and route of mesh is arranged in brush coating on the net
The shape of plate uplifting window is identical.
3. a kind of detection method of PCB leakproof lettering symbol as described in claim 1, it is characterised in that: the conduction in step 3
Medium is conductive tape, and the thickness of solder mask layer is identical and the area of conductive tape is detected greater than PAD for the thickness of conductive tape
The area of unit, conductive tape are equipped with several point off formula tear lines identical with windowing shape.
4. a kind of detection method of PCB leakproof lettering symbol as claimed any one in claims 1 to 3, it is characterised in that: PAD
Detection unit includes three pads, and three pads are sequentially connected electrically by conducting wire；In step 4 include two secondary design characters, first
When secondary design character, the copper of the windowing of first end is covered with a character point bigger than the windowing of pad, and aside
Add the first mark；When the second secondary design character, with a big character point of windowing than pad by the copper of the windowing of the second end
It covers, and aside adds the second mark；Wherein, the first mark is different with the second mark.
5. a kind of detection method of PCB leakproof lettering symbol as claimed in claim 4, it is characterised in that: the first mark and second
Mark is Arabic numerals.
6. a kind of detection method of PCB leakproof lettering symbol as claimed in claim 5, it is characterised in that: first is denoted as " 1 "；.
Second is denoted as " 2 ".
7. a kind of detection method of PCB leakproof lettering symbol as described in claim 1, it is characterised in that: the setting of PAD detection unit
The position of not element in the technique edges or unit of assist side.
8. a kind of detection method of PCB leakproof lettering symbol as described in claim 1, it is characterised in that: pad is round and welds
The outer diameter of disk is 40mil, and opening a window as the outer diameter of the circle concentric with pad and windowing is 43mil.
9. a kind of detection method of PCB leakproof lettering symbol as claimed in claim 8, it is characterised in that: the outer diameter of character block is big
In or equal to 48mil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810746465.XA CN108957291A (en) | 2018-07-09 | 2018-07-09 | A kind of detection method of PCB leakproof lettering symbol |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810746465.XA CN108957291A (en) | 2018-07-09 | 2018-07-09 | A kind of detection method of PCB leakproof lettering symbol |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108957291A true CN108957291A (en) | 2018-12-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810746465.XA Pending CN108957291A (en) | 2018-07-09 | 2018-07-09 | A kind of detection method of PCB leakproof lettering symbol |
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| Country | Link |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110730564A (en) * | 2019-09-17 | 2020-01-24 | 沪士电子股份有限公司 | Method for preventing missing processing of tool holes of PCB |
| CN112888146A (en) * | 2020-12-30 | 2021-06-01 | 珠海超群电子科技有限公司 | Method for detecting missing printed characters of circuit board |
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| CN102445648A (en) * | 2010-10-13 | 2012-05-09 | 富葵精密组件(深圳)有限公司 | Method for detecting skip printing of characters of circuit board |
| CN202335066U (en) * | 2011-11-14 | 2012-07-11 | 北大方正集团有限公司 | Printed circuit board |
| CN202374564U (en) * | 2011-12-28 | 2012-08-08 | 胜华电子（惠阳）有限公司 | Character skip printing inspection module of circuit board |
| CN103033737A (en) * | 2012-12-17 | 2013-04-10 | 春焱电子科技（苏州）有限公司 | Printed circuit board (PCB) through printing character detecting method |
| CN103616412A (en) * | 2013-11-28 | 2014-03-05 | 深圳市景旺电子股份有限公司 | Character skip printing prevention detection method for PCB (printed circuit board) |
-
2018
- 2018-07-09 CN CN201810746465.XA patent/CN108957291A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102445648A (en) * | 2010-10-13 | 2012-05-09 | 富葵精密组件(深圳)有限公司 | Method for detecting skip printing of characters of circuit board |
| CN202335066U (en) * | 2011-11-14 | 2012-07-11 | 北大方正集团有限公司 | Printed circuit board |
| CN202374564U (en) * | 2011-12-28 | 2012-08-08 | 胜华电子（惠阳）有限公司 | Character skip printing inspection module of circuit board |
| CN103033737A (en) * | 2012-12-17 | 2013-04-10 | 春焱电子科技（苏州）有限公司 | Printed circuit board (PCB) through printing character detecting method |
| CN103616412A (en) * | 2013-11-28 | 2014-03-05 | 深圳市景旺电子股份有限公司 | Character skip printing prevention detection method for PCB (printed circuit board) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110730564A (en) * | 2019-09-17 | 2020-01-24 | 沪士电子股份有限公司 | Method for preventing missing processing of tool holes of PCB |
| CN112888146A (en) * | 2020-12-30 | 2021-06-01 | 珠海超群电子科技有限公司 | Method for detecting missing printed characters of circuit board |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20181207 |