CN104914113B - Printed circuit board automatic optical detection method - Google Patents
Printed circuit board automatic optical detection method Download PDFInfo
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- CN104914113B CN104914113B CN201510264713.3A CN201510264713A CN104914113B CN 104914113 B CN104914113 B CN 104914113B CN 201510264713 A CN201510264713 A CN 201510264713A CN 104914113 B CN104914113 B CN 104914113B
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Abstract
The present invention provides a kind of printed circuit board automatic optical detection method.The printed circuit board automatic optical detection method includes: the working face that test print circuit board is fixed to the first objective table in the way of vacuum suction；The second objective table is moved horizontally to above first objective table by horizontal displacement electric cylinders, and executes optical detection using upper surface of the optical module of second objective table to the test print circuit board in moving process；By vertical displacement electric cylinders by second objective table move vertically to the test print circuit board contacts, and by vacuum suction mode by the test print circuit board be fixed to second objective table working face；Second objective table execution is moved horizontally by the horizontal displacement electric cylinders, and executes optical detection using lower surface of the optical module of first objective table to the test print circuit board in moving process.
Description
Technical field
The present invention relates to printed circuit board (Printed Circuit Board, PCB) manufacturing fields to be particularly related to one
Kind printed circuit board automatic optics inspection (Automated Optical Inspection, AOI) method.
Background technique
Printed circuit board mainly detects printed circuit board using automatic optics inspection scheme in manufacturing process at present
The line defct on two sides, such as line short, open circuit, pin hole, wiping flower, line children, the thick, canine tooth of line etc..Traditional printed circuit board
Automatic optical detection method is that line-scan digital camera and lower line-scan digital camera is respectively set in the upper and lower of row rumble, and test print circuit board is logical
Space rumble is advanced between upper line-scan digital camera and lower line-scan digital camera, and upper line-scan digital camera and lower linear array phase are utilized during traveling
Machine takes pictures respectively to the both side surface of printed circuit board to be measured to realize automatic optics inspection.
However, may be subjected to the bounce of row rumble during traveling using the test print circuit board that row rumble transmits and be in
Jounce condition, therefore fixed motion profile is difficult to realize on microcosmic.Due to the above problems, traditional printed circuit
Plate automatic optical detection method may have erroneous judgement or defect missing inspection in the detection process of printed circuit board.
In view of this, it is necessary to provide a kind of printed circuit board automatic optical detection methods that can solve the above problem.
Summary of the invention
One of purpose of the invention is to provide a kind of printed circuit board automatic optics inspection side to solve above-mentioned
Method.
Printed circuit board automatic optical detection method provided by the invention, comprising: A, will be to be measured in the way of vacuum suction
Printed circuit board is fixed to the working face of the first objective table；B, the second objective table is moved horizontally to institute by horizontal displacement electric cylinders
It states above the first objective table, and the optical module in moving process using second objective table is to the test print circuit
The upper surface of plate executes optical detection；C, by vertical displacement electric cylinders by second objective table move vertically to it is described to be measured
Printed circuit board contact, and the work by vacuum suction mode by the test print circuit board fixed to second objective table
Make face；D, second objective table execution is moved horizontally by the horizontal displacement electric cylinders, and utilizes institute in moving process
The optical module for stating the first objective table executes optical detection to the lower surface of the test print circuit board.
In a preferred embodiment of printed circuit board automatic optical detection method provided by the invention, in the step A
Before, further includes: A0, the working face that the test print circuit board level is sent to first objective table, and in level
Transmit process provides air-bed so that the test print circuit board is to hang for the test print circuit board by blowing operation
Floating state carries out horizontal transmission.
In a preferred embodiment of printed circuit board automatic optical detection method provided by the invention, the step A packet
It includes: A1, cancelling the air-bed after the working face that the test print circuit board is transmitted to first objective table so that institute
Test print circuit board is stated to tile to the working face of first objective table；A2, the working face unlatching in first objective table
Vacuum pumping and make the lower surface vacuum suction of the test print circuit board to the working face of first objective table.
In a preferred embodiment of printed circuit board automatic optical detection method provided by the invention, the vertical displacement
Electric cylinders are connected to the horizontal displacement electric cylinders, and the end of the vertical displacement electric cylinders is arranged in second objective table.
In a preferred embodiment of printed circuit board automatic optical detection method provided by the invention, the step B packet
It includes: B1, driving the vertical displacement electric cylinders to move horizontally together with the second objective table of its end by the horizontal displacement electric cylinders
To first objective table；The CCD camera array and linear light of the working face of second objective table is arranged in B2, unlatching
Source, during second objective table is moved to above first objective table, using the CCD camera array to described
The upper surface route of test print circuit board executes optical scanner detection.
In a preferred embodiment of printed circuit board automatic optical detection method provided by the invention, the step C packet
It includes: C1, driving the second objective table of its end to drop to the upper of the test print circuit board by the vertical displacement electric cylinders
Surface is in contact, and second objective table decline during close first objective table vacuum suction and to it is described to
It surveys printed circuit board and executes vertical operation, so that the test print circuit board is converted to suspension from vacuum adsorption state
State；C2, it opens vacuum pumping in the working face of second objective table and keeps the upper surface of the test print circuit board logical
Cross the working face of vacuum suction to second objective table.
In a preferred embodiment of printed circuit board automatic optical detection method provided by the invention, the step C is also
Include: C3, drive the second objective table of its end to rise to preset height by the vertical displacement electric cylinders, wherein described default
Height meets the shooting focal length requirement for being located at the optical module of working face of first objective table.
In a preferred embodiment of printed circuit board automatic optical detection method provided by the invention, the step D packet
It includes: D1, the second objective table level court point that the vertical displacement electric cylinders are driven by the horizontal displacement electric cylinders together with its end
Platform direction is picked to be horizontally moved；The CCD camera array and linear light of the working face of first objective table is arranged in D2, unlatching
Source, during second objective table moves horizontally, using the CCD camera array of first objective table to the print to be measured
The lower surface route of printed circuit board executes optical scanner detection.
In a preferred embodiment of printed circuit board automatic optical detection method provided by the invention, further includes: E, general
The test print circuit board is discharged to the sorting platform, and is held using the sorting platform to the test print circuit board
Row sorting processing.
In a preferred embodiment of printed circuit board automatic optical detection method provided by the invention, the step E packet
It includes: E1, the vacuum suction that second objective table is closed after second objective table is moved to above the sorting platform
And the test print circuit board is discharged into the sorting platform surface；E2, according to the automatic of the test print circuit board
The test print circuit board point is seen corresponding printed circuit board using the sorting platform and sorted by optical detection result
Area.
Compared to the prior art, printed circuit board automatic optical detection method provided by the invention using displacement electric cylinders come into
The transmission of row test print circuit board, and by displacement electric cylinders and vacuum plate sucking asynchronous operation, test print electricity can be improved
Planarization of the displacement accuracy and guarantee test print circuit board of road plate during automatic optics inspection, reduces automated optical inspection
The problem of measuring existing erroneous judgement or defect missing inspection.In addition, the printed circuit board automatic optical detection method is in the second objective table
The automatic optics inspection that the upper and lower surface for test print circuit board is completed when moving horizontally back and forth, can also effectively improve
Automatic optics inspection efficiency.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing, in which:
Fig. 1 is the automatic optical detecting system that printed circuit board automatic optical detection method provided by the invention can be applicable in
A kind of structural schematic diagram of embodiment；
Fig. 2 is a kind of flow diagram of embodiment of printed circuit board automatic optical detection method provided by the invention.
Specific embodiment
The technical scheme in the embodiments of the invention will be clearly and completely described below, it is clear that described implementation
Example is only a part of the embodiments of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
Technical staff's all other embodiment obtained without making creative work belongs to the model that the present invention protects
It encloses.
Printed circuit board automatic optical detection method provided by the invention can be useful in printed circuit board as shown in Figure 1
Automatic optical detecting system 1.The printed circuit board automatic optical detecting system 1 includes base station 11, displacement electric cylinders 12, first
Objective table 13, the second objective table 14 and sorting platform 15.Preferably, in a particular embodiment, the automatic light of the printed circuit board
Learning detection system 1 can also include control server (not shown), for controlling the displacement electric cylinders 12, first loading
The working condition of platform 13, second objective table 14 and the sorting platform 15.
First objective table 13 and second objective table 14 can be respectively lower objective table and upper objective table, the two point
Test print circuit board Yong Yu not be carried in a manner of vacuum suction in the different phase of automatic optics inspection process.Wherein, institute
It states the first objective table 13 and the sorting platform 15 is separately positioned on the surface of the base station 11, and second objective table 14
Be connected to the displacement electric cylinders 12, and is arranged towards the base station 12.Second objective table 14 can be in the displacement
Horizontal displacement and vertical displacement are evenly carried out under the action of electric cylinders 12.
In the present embodiment, as shown in Figure 1, the displacement electric cylinders 12 may include horizontal displacement electric cylinders 121 and vertical position
Move electric cylinders 122；The end of the vertical displacement electric cylinders 122, and the vertical displacement electric cylinders are arranged in second objective table 14
122 are connected further to the horizontal displacement electric cylinders 121.Specifically, the horizontal displacement electric cylinders 121 can take in the control
It is engaged in carrying out horizontal displacement operation under the control of device, so that the vertical displacement electric cylinders 122 drive second objective table 14
It moves in the horizontal direction；And the vertical displacement electric cylinders 122 can carry out vertical displacement under the control of the control server
Operation, so that second objective table 14 be driven to be movable in a vertical direction.
In printed circuit board automatic optical detecting system 1 provided by the invention, the horizontal displacement electric cylinders 121 and institute
Stating vertical displacement electric cylinders 122 can be servo electric cylinders, using the horizontal displacement electric cylinders 121 and the vertical displacement electric cylinders
122 can not only guarantee at the uniform velocity the moving for test print circuit board in automatic optics inspection process, but also may be implemented
Height displacement precision controlling, such as its displacement accuracy horizontally and vertically can achieve 0.005 micron or more.
In a particular embodiment, surface opposite with second objective table 14 in first objective table 13 can position
For the working face 131 of first objective table 13, and the working face 131 can along test print circuit board direction of transfer
To have respectively included circuit board positioning area 137 and optical module area 138.
The circuit board positioning area 137 be used for when executing automatic optics inspection to printed circuit board to be measured positioned with
And fixed operation, for example, in one embodiment, as shown in Figure 1, the circuit board positioning area 137 can be set it is multiple fixed
Position block 135 and it is multiple vacuumize slot 132, the multiple position block 135 is mainly used for passing in test print circuit board level
Positioning operation is carried out to the test print circuit board when being sent to the working face 131 of first objective table 13.The multiple pumping
The circuit board positioning area 137 of first objective table 13 can be arranged in vacuum tank 132 in a distributed manner, be mainly used for described
Vacuum pumping is carried out after the positioning of test print circuit board, so that the test print circuit board can be inhaled by vacuum
The smooth surface for being tightly fixed to the circuit board positioning area 137 of subsidiary formula formula.
Preferably, each, which vacuumizes slot 132, independently installed can check-valves, and the check-valves is mainly used for described
The size of test print circuit board is smaller and can not to cover certain slots 132 that vacuumize be that can close described to vacuumize slot 132
Vacuum pumping, thus the speed for guaranteeing the overall vacuum degree of the working face 131 of first objective table 13 and vacuumizing.
In addition, the circuit board positioning area 137 can also be formed with multiple gas holes 136, the multiple gas hole 136 is same
Sample can be formed in a distributed manner in the circuit board positioning area 137, and it can be between slot 132 with the multiple vacuumize
Alternate interval setting.136 one side of gas hole can be used for being transmitted to institute in the test print circuit board level
It states during the first objective table 13 and executing blowing operation under the control in the control server to the print to be measured
Printed circuit board provides air-bed, so that the test print circuit board can keep suspended state during traveling, to keep away
Exempt from the test print circuit board and causes line fault due to being occurred copper face scraping by gravity；On the other hand, institute
Stating gas hole 136 can be also used for after the test print circuit board completes the optical detection of upper surface route through the behaviour that blows
Make to provide upward thrust to the test print circuit board, in order to which the test print circuit board is detached from first loading
Platform 13 and the working face for being adsorbed onto second objective table 14.
The optical module area 138 may include CCD (Charge Coupled Device, charge-coupled device) camera
Array 133 and linear light source 134.Wherein the CCD camera array 133 includes multiple aligned CCD cameras, also, institute
The orientation for stating multiple CCD cameras is vertical with the direction of motion of the test print circuit board, so that the CCD camera battle array
The coverage of column 133 can cover the overall width of the test print circuit board.The linear light source 134 can be set
The edge in the optical module area 138, and it is substantially parallel with the CCD camera array 133.
The specific structure of second objective table 14 can be almost the same with first objective table 13, no longer superfluous herein
It states；It being understood, however, that in a particular embodiment, the gas hole 136 of first objective table 13 is for second objective table
It can be optional structure for 14, in other words, second objective table 14 can be not provided with gas hole.
Based on above-mentioned printed circuit board automatic optical detecting system 1, the present invention furthermore provides a kind of printed circuit board
Automatic optical detection method, the automatic optical detection method can cooperate described first by displacement electric cylinders 12 shown in FIG. 1
Objective table 13 and the second objective table 14 realize the printed circuit board automatic optical detecting system 1 for the test print electricity
The asynchronous operation of the optical detection of the upper and lower surface of road plate and upper and lower article carrying platform suction disc.
Specifically, Fig. 2 is referred to, is that the process of printed circuit board automatic optical detection method provided by the invention is illustrated
Figure.The printed circuit board automatic optical detection method may comprise steps of:
Test print circuit board level is sent to the first objective table by step S1；
Specifically, test print circuit board can be transmitted to the automated optical by horizontal conveyor (for example passing rumble)
First objective table 13 of detection system 1, and the gas hole 136 of the first objective table 13 described in transmit process is opened to be formed
Air-bed and allow the test print circuit board to be transmitted to the working face 131 of first objective table 13 with suspended state.
On the one hand the air-bed that the gas hole 136 provides can reduce the test print circuit board exists during horizontal transmission
Frictional force, therefore only need to provide a lesser thrust to the test print circuit board it can be pushed along described the
The working face 131 of one objective table 13 carries out horizontal transmission, and on the other hand the suspension transmission of the test print circuit board can have
Effect avoids the problem that the test print circuit board occurs copper face in transmission process and scratches.
The test print circuit board is fixed to the work of first objective table by step S2 in the way of vacuum suction
Face；
Specifically, when the test print circuit board level is transmitted to first objective table 13 and by described fixed
When position block 135 stops, the control server may determine that the test print circuit board has arrived at described first and carries
The circuit board positioning area 137 of object platform 13.It is closed at this point, on the one hand the control server can control first objective table 13
The gas hole 136 removes the air-bed, and the test print circuit board is allowed to decline and tile from suspended state
To the main surface of first objective table 13；On the other hand, the control server can also open simultaneously described vacuumizes slot
137 carry out vacuum pumping, so that the test print circuit board can be smooth and tight by way of vacuum suction
The surface for thickly attaching to the circuit board positioning area 137 avoids the occurrence of plate bending or influences automatic the phenomenon that plate is stuck up
The precision of optical detection.
Second objective table is moved horizontally to above first objective table by step S3 by horizontal displacement electric cylinders, and
Optics is executed using upper surface of the optical module of second objective table to the test print circuit board in moving process to examine
It surveys；
Specifically, being fixed to first objective table 13 by way of vacuum suction in the test print circuit board
Working face 131 when, the control server can further control the horizontal displacement electric cylinders 121 horizontal displacement operation,
Drive the second objective table 14 of the vertical displacement electric cylinders 122 and its end along from institute by the horizontal displacement electric cylinders 121
The direction for stating sorting platform 15 to first objective table 13 is horizontally moved, and in the process of moving, and described second
The linear light source and CCD camera array of objective table 14, which are opened, executes automatic optics inspection, to realize in second objective table 14
Move horizontally during complete for the test print circuit board upper surface route automatic optics inspection.
Based on above scheme, when second objective table 14 is moved horizontally to the surface of first objective table 13,
The linear light source and CCD camera array of second objective table 14 are exactly completed the upper surface institute for the test print circuit board
There is the optical scanner in region to detect.
Step S4 is moved vertically to second objective table and the test print circuit board by vertical displacement electric cylinders
Contact, and the working face by vacuum suction mode by the test print circuit board fixed to second objective table；
After the upper surface optical detection of the test print circuit board is completed, the control server can be further
Control the vertical displacement electric cylinders 122 and carry out vertical displacement operation, thus drive the second objective table 14 of its end drop to
The upper surface of the test print circuit board contacts；Also, during the decline of second objective table 14, the control clothes
Business device can also close vacuumizing slot 132 and opening the gas hole 136 for first objective table 13 so that it is described to
It surveys printed circuit board and is converted to suspended state again from vacuum adsorption state.
On the other hand, the control server, which can also control second objective table 14 and open it, vacuumizes slot, thus
It realizes after the working face of second objective table 14 is contacted with the upper surface of the test print circuit board, is inhaled by vacuum
Attached mode is smooth by the test print circuit board and is closely fixed to the working face of second objective table 14.
Hereafter, the control server can further control second that the vertical displacement electric cylinders 122 drive its end
Objective table 14 carries out lifting operations, and the linear light source 134 of first objective table 13 and CCD camera array 133 just face as a result,
The lower surface of the test print circuit board；In a particular embodiment, the lifting height of second objective table 14 can basis
Depending on actual needs, it is subject to the shooting focal length for meeting the CCD camera array 133 of first objective table 13.
Second objective table is moved horizontally to above sorting platform by step S5 by the horizontal displacement electric cylinders, and
Optics is executed using lower surface of the optical module of first objective table to the test print circuit board in moving process
Detection；
The test print circuit board described in 14 vacuum suction of the second objective table and pass through the vertical displacement electric cylinders
122 rise to after preset height, and the control server can control the horizontal displacement electric cylinders 121 and carry out horizontal displacement behaviour
Make, thus drive the vertical displacement electric cylinders 122 be connected to the second objective table 14 of its end towards 15 direction of sorting platform into
Row moves horizontally；Also, during moving horizontally, the control server can also control first objective table 13
CCD camera array 133 and linear light source 134, which are opened, executes automatic optics inspection, to realize the water in second objective table 14
The automatic optics inspection of the lower surface route for the test print circuit board is completed during translation is dynamic.
Step S6 discharges the test print circuit board to the sorting platform surface；
After the surface that second objective table 14 is moved to the sorting platform 15, the control server can be with
Control second objective table 14 and close it and vacuumize slot, at this point, since vacuum suction cancels, the test print circuit board by
The surface of the sorting platform 15 is fallen in gravity, the sorting platform 15 can be serviced further in the control
It under the control of device, is sorted according to the optical detection result of the test print circuit board, i.e., by non-defective unit, upper surface defective products
Corresponding printed circuit board off-sorting station is sorted to lower surface defective products.
Compared to the prior art, printed circuit board automatic optical detection method provided by the invention using displacement electric cylinders come into
The transmission of row test print circuit board, and by displacement electric cylinders and vacuum plate sucking asynchronous operation, test print electricity can be improved
Planarization of the displacement accuracy and guarantee test print circuit board of road plate during automatic optics inspection, reduces automated optical inspection
The problem of measuring existing erroneous judgement or defect missing inspection.In addition, the printed circuit board automatic optical detection method is in the second objective table
The automatic optics inspection that the upper and lower surface for test print circuit board is completed when moving horizontally back and forth, can also effectively improve
Automatic optics inspection efficiency.
The above description is only an embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright description is applied directly or indirectly in other relevant technology necks
Domain is included within the scope of the present invention.
Claims (7)
1. a kind of printed circuit board automatic optical detection method characterized by comprising
A0, the working face that test print circuit board level is sent to the first objective table, and pass through air blowing in horizontal transmission process
Operation provides air-bed so that the test print circuit board is with suspended state carry out level biography for the test print circuit board
It send；
A, test print circuit board is fixed to the working face of the first objective table, first objective table in the way of vacuum suction
Working face include circuit board positioning area and optical module area, the circuit board positioning area is equipped with multiple position blocks and multiple pumpings
Vacuum tank；
B, the second objective table is moved horizontally to above first objective table by horizontal displacement electric cylinders, and in moving process
Optical detection is executed to the upper surface of the test print circuit board using the optical module of second objective table；
C, by vertical displacement electric cylinders by second objective table move vertically to the test print circuit board contacts, and lead to
Cross the working face that the test print circuit board is fixed to second objective table by vacuum suction mode；Wherein: described vertical
Displacement electric cylinders are connected to the horizontal displacement electric cylinders, and the end of the vertical displacement electric cylinders is arranged in second objective table；
The step C includes:
C1, the second objective table of its end is driven to drop to the upper of the test print circuit board by the vertical displacement electric cylinders
Surface is in contact, and second objective table decline during close first objective table vacuum suction and to it is described to
It surveys printed circuit board and executes vertical operation, so that the test print circuit board is converted to suspension from vacuum adsorption state
State；
C2, it opens vacuum pumping in the working face of second objective table and keeps the upper surface of the test print circuit board logical
Cross the working face of vacuum suction to second objective table；
D, second objective table execution is moved horizontally by the horizontal displacement electric cylinders, and using described in moving process
The optical module of first objective table executes optical detection to the lower surface of the test print circuit board.
2. printed circuit board automatic optical detection method according to claim 1, which is characterized in that the step A includes:
A1, the air-bed is cancelled after the working face that the test print circuit board is transmitted to first objective table so that institute
Test print circuit board is stated to tile to the working face of first objective table；
A2, first objective table working face open vacuum pumping and keep the lower surface of the test print circuit board true
Suction is attached to the working face of first objective table.
3. printed circuit board automatic optical detection method according to claim 1, which is characterized in that the step B includes:
B1, the vertical displacement electric cylinders are driven to move horizontally together with the second objective table of its end by the horizontal displacement electric cylinders
To first objective table；
The CCD camera array and linear light source of the working face of second objective table is arranged in B2, unlatching, in second objective table
During being moved to above first objective table, using the CCD camera array to the upper of the test print circuit board
Surface lines execute optical scanner detection.
4. printed circuit board automatic optical detection method according to claim 1, which is characterized in that the step C is also wrapped
It includes:
C3, the second objective table of its end is driven to rise to preset height by the vertical displacement electric cylinders, wherein described default
Height meets the shooting focal length requirement for being located at the optical module of working face of first objective table.
5. printed circuit board automatic optical detection method according to claim 1, which is characterized in that the step D includes:
D1, drive the vertical displacement electric cylinders together with the second objective table level court point of its end by the horizontal displacement electric cylinders
Platform direction is picked to be horizontally moved；
The CCD camera array and linear light source of the working face of first objective table is arranged in D2, unlatching, in second objective table
During moving horizontally, using the CCD camera array of first objective table to the following table upper thread of the test print circuit board
Road executes optical scanner detection.
6. printed circuit board automatic optical detection method according to claim 5, which is characterized in that further include:
E, the test print circuit board is discharged to the sorting platform, and using the sorting platform to the test print
Circuit board executes sorting processing.
7. printed circuit board automatic optical detection method according to claim 6, which is characterized in that the step E includes:
E1, the vacuum suction that second objective table is closed after second objective table is moved to above the sorting platform
And the test print circuit board is discharged into the sorting platform surface；
E2, according to the automatic optics inspection of the test print circuit board as a result, using the sorting platform by the print to be measured
Printed circuit board is sorted to corresponding printed circuit board off-sorting station.
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| CN201510264713.3A CN104914113B (en) | 2015-05-18 | 2015-05-18 | Printed circuit board automatic optical detection method |
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| CN104949992A (en) * | 2015-05-19 | 2015-09-30 | 东莞市威力固电路板设备有限公司 | Printed circuit board (PCB) automated optical inspection (AOI) system and PCB objective table suitable for same |
| CN104949991A (en) * | 2015-05-19 | 2015-09-30 | 东莞市威力固电路板设备有限公司 | Printed circuit board (PCB) automated optical inspection (AOI) system and PCB objective table suitable for same |
| CN105486696A (en) * | 2015-11-20 | 2016-04-13 | 凌云光技术集团有限责任公司 | Circuit board conveying and detecting apparatus and circuit board conveying and detecting method |
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| CN109490329A (en) * | 2017-09-12 | 2019-03-19 | 旭东机械工业股份有限公司 | Optical element checks equipment |
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| CN203981603U (en) * | 2014-07-28 | 2014-12-03 | 苏州华兴源创电子科技有限公司 | A kind of pick-up unit for the positive inverse plate surface of liquid crystal panel is detected |
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