CN207662807U - A kind of device of automatic detection transparent parts surface defect - Google Patents
A kind of device of automatic detection transparent parts surface defect Download PDFInfo
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- CN207662807U CN207662807U CN201721691930.1U CN201721691930U CN207662807U CN 207662807 U CN207662807 U CN 207662807U CN 201721691930 U CN201721691930 U CN 201721691930U CN 207662807 U CN207662807 U CN 207662807U
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Abstract
The utility model discloses a kind of devices of automatic detection transparent parts surface defect, including：Pallet, top view camera, side view camera and lighting source；Pallet is equipped with detection zone；Top view camera is arranged in the surface of detection zone；Side view camera is arranged in the top of detection zone, and the angle between top view camera and side view camera is not zero；Lighting source is arranged in the top of detection zone, and the angle between top view camera and lighting source is more than the angle between top view camera and side view camera；Pallet is made by black material；Detection zone surface darkly color mirror surface structure, alternatively, pallet, which is equipped with through-hole, is used as detection zone, through-hole is equipped with object placing platform rank.The utility model detects the device of transparent parts surface defect automatically, it can be achieved that automatic detection to transparent parts defect, and can distinguish the face where defect, that is, is suitable for planar part, is also suitable for non-flat surface parts.
Description
Technical field
The utility model is related to a kind of devices of automatic detection transparent parts surface defect, belong to automatic detection field.
Background technology
The automatic detection of transparent parts surface defect is all the time since the interference of the factors such as transmission, reflection, refraction is difficult to
It realizes.A kind of relatively simple transparent parts are planar transparent parts, for example, optical window sheets, optics graduation piece, watch face,
Mobile phone faceplate, television panels etc. are still to lack the equipment detected automatically using artificial detection substantially at present in production practices.
The difficult point of transparent parts surface defects detection is its transparency, when acquiring image, the defect of part upper surface
It will be imaged in image planes simultaneously with the defect of lower surface, cause upper and lower surface defect dipoles inaccurate, so up to the present, it is big absolutely
Partial optical effect correction factory, it is main still to carry out defects detection using artificial.
Utility model content
In order to solve the defects of transparent parts surface cannot achieve automatic detection in the prior art, the utility model provides one
The device of the automatic detection transparent parts surface defect of kind.
In order to solve the above technical problems, technical solution used by the utility model is as follows：
A kind of device of automatic detection transparent parts surface defect, including：Pallet, top view camera, side view camera and illumination
Light source；
Pallet is equipped with detection zone；Top view camera is arranged in the surface of detection zone；Side view camera is arranged in detection zone
Top, and the angle between top view camera and side view camera is not zero；Lighting source is arranged in the top of detection zone, and top view phase
Angle between machine and lighting source is more than the angle between top view camera and side view camera；
Pallet is made by black material；Detection zone surface darkly color mirror surface structure, alternatively, pallet is equipped with through-hole as inspection
Area is surveyed, through-hole is equipped with object placing platform rank.
Above-mentioned top view camera and side view camera are for the part to be checked in shot detection area, therefore top view camera and side view
The camera lens of camera is all the angle between top view camera and side view camera against part to be checked：Referred to top view camera and to be checked
The straight line of part and the angle excessively between side view camera and the straight line of part to be checked；Lighting source is to be shone to part to be checked
It is bright, therefore lighting source is arranged against part to be checked, the angle between top view camera and lighting source is more than top view camera
Angle between side view camera refers to：Cross the straight line of the straight line and over-illumination light source and part to be checked of top view camera and part to be checked
It is formed by angle, be more than the straight line of top view camera and part to be checked and crosses the straight line formation of side view camera and part to be checked
Angle.
Above-mentioned pallet can be arranged on XY displacement platforms, and convenience and high-efficiency batch detection may also be arranged on other supporting tables
Or on supporting rack, specific XY displacement platforms, supporting table or supporting rack are using existing known relevant device, top view phase
Machine, side view camera and lighting source when in use, are also integrally fixed in relevant holder or equipment, are existing common sense, the application
It does not introduce excessively.
Above-mentioned apparatus examines the dark-field imaging of piece surface by treating, and analysis fault is with the presence or absence of ghost image or leaves original
The variation of point distance, realizes the differentiation to upper table planar defect and following table planar defect, to realize to upper surface and/or lower surface light
The automatic detection of cleanliness.
The application up and down, top, the relative position when ranges word such as bottom refers both to device normal use.
In order to improve the accuracy of detection, the illuminating ray from lighting source, either direct projection still reflect, and cannot
Into top view camera and side view camera, for top view camera and side view camera, the effect of a dark-ground illumination is formed.
It is preferred that pallet is made by black glass, detection zone surface darkly color mirror surface structure；Alternatively, pallet is closed by black aluminium
Gold makes, and pallet is equipped with through-hole as detection zone, and through-hole is equipped with object placing platform rank, and object placing platform rank is located at through-hole inner surface.
In order to improve the stability of detection, when pallet is made by black glass, detection zone is by tray upper surface concave shape
At.A certain size hole can be dug out on black glass surface when making, then polish the bottom surface in hole to form black minute surface.
When pallet is made by black aluminium alloy, a certain size through-hole can be dug out on black aluminium alloy, and in through-hole
Inner surface edge at design there are one small steps for placing part to be checked.
In order to improve stability in use, object placing platform rank is located at through-hole inner surface.
In order to facilitate control, while stability in use is improved, detection zone is located at the center of pallet.
It is preferred that detection zone is circle.
In order to improve the accuracy of detection, the angle between top view camera and side view camera is 5-25 °.
It is preferred that the illuminating ray from lighting source is irradiated to detection zone in a manner of glancing incidence.
In order to improve detection accuracy, the incident angle of illuminating ray to the detection zone of lighting source is 50-90 °.
Lighting source, it is necessary to be the illumination light with certain directionality, with larger incidence angle, in the side of similar glancing incidence
Formula is treated inspection piece surface and is illuminated.
In order to improve detection efficiency, the automatic device for detecting transparent parts surface defect, further includes XY displacement platforms, pallet
It is located on XY displacement platforms.Efficient batch detection can be achieved.
The method for detecting transparent parts surface defect using the device of above-mentioned automatic detection transparent parts surface defect, will wait for
Zero-detection part is placed on detection zone, and the differentiation for treating zero-detection part upper table planar defect and following table planar defect is realized by ghost image, or
Picture by checking fault leaves whether initial point distance changes the area for realizing and treating zero-detection part upper table planar defect and following table planar defect
Point.
When pallet is made by black glass, detection zone surface darkly color mirror surface structure when：Part to be checked is in pallet detection zone
Upper formation inverted image imaging, top view camera are located at the surface of part to be checked, the illuminating ray from lighting source, either direct projection
Or it reflects, cannot enter top view camera and side view camera, for top view camera and side view camera, form one secretly
The effect of field illumination；Assuming that tray surface is completely flawless, while assuming that part to be checked is circle, it is upper when part to be checked
Lower surface then from top view camera and side view camera institute the image collected is respectively a perfect dark circles completely without defect
Spot and black ellipse spot；When part upper surface to be checked is there are when fault B, meeting forms a virtual image B ' in the minute surface of detection zone, when
Optical element lower surface to be measured then will not form a virtual image, when top view camera is adopted there are when fault A in the minute surface of detection zone
Occur a bright spot on the image collected, and occurs on side view camera inclined direction in side view camera institute the image collected
Identical pairs of bright spot, then this defect is upper table planar defect, non-paired when occurring in side view camera institute the image collected
The bright spot of appearance is then the defect of lower surface；
When there are fault B, (it can form a virtual image relative to the minute surface where detection zone for part upper surface to be checked
B '), at the same part lower surface to be checked there are when fault A (will not relative to tray bottom minute surface formed a virtual image),
Image acquired in top view camera is still a black round spot, but can increase by two bright spots, corresponds to the defect A of lower surface
With the defect B of upper surface, wherein defect point B and its virtual image B ' due to projection relation, in the image obtained obtained by top view camera
It is a point B/B ' then to overlap, therefore single by top view camera is that defect cannot be distinguished is upper surface or lower surface；And
In the image acquired in side view camera, due to projection relation, then size along inclined direction is compressed according to cosine rule, and is hung down
It is directly then uncompressed in the size of inclined direction, obtains Black oval spot, i.e., following cosine projection relationship
L⊥=L‖cosθ
W⊥=W|cosθ
W represents width, and L represents length；And ⊥ and ‖ then indicate two mutually perpendicular directions, in above formula, before "="
Under be designated as ⊥, be designated as ‖ under "=" is subsequent.There are three bright spots in black ellipse spot background acquired in side view camera, respectively
Corresponding lower surface defect point A, upper surface defect point B and its virtual image B ', in this way, relying solely on a side view camera can distinguish
Defect point is upper surface or lower surface, as long as going out in pairs along occurring two striking resemblances on side view camera inclined direction
Existing bright spot, this defect is upper table planar defect；The bright spot of other non-paired appearance is then the defect of lower surface.It is distinguishing
After defect point upper and lower surfaces of, B ' virtual image points are disposed, and by the oval image inverting of equation provided above handle at circle
Image can calculate separately out the finish grade of upper and lower surface.
When pallet is made by black aluminium alloy, pallet is equipped with through-hole and is used as detection zone, equipped with object placing platform rank in through-hole
When, part to be checked is placed on object placing platform rank, the illuminating ray from lighting source, either direct projection still reflect, and cannot
Into top view camera and side view camera, for two cameras, the effect of a dark-ground illumination is formed；Assuming that tray surface
It is completely flawless, while assumes that part to be checked is circle, when the upper and lower surface of part to be checked is also completely without defect, then divides
It is not a perfect black round spot and black ellipse spot from top view camera and side view camera institute the image collected；When waiting for zero-detection
There are one defect point B, lower surfaces for the upper surface of part there are one defect point A, and the image acquired in the top view camera of field is still one
Black round spot, but two bright spots can be increased, correspond to the defect B of the defect A and upper surface of lower surface, side view camera is obtained
The image taken according to the inverting of cosine projection relationship at the image acquired in top view camera, will be in the bright spot to image on inverting image
The distance of the heart is obtained in image with top view camera and is compared at a distance from bright spot to picture centre, every apart from changed
Belong to the defect of lower surface, the constant defect for belonging to upper surface.
In the image acquired in side view camera, due to projection relation, then size along inclined direction is according to cosine rule quilt
Compression, and be then uncompressed perpendicular to the size of inclined direction, obtain Black oval spot, i.e., following cosine projection relationship
L⊥=L‖cosθ
W⊥=W‖cosθ
W represents width, and L represents length；And ⊥ and ‖ then indicate two mutually perpendicular directions.In black ellipse spot background
On also there are two bright spot, correspond to lower surface defect point A, upper surface defect point B respectively.In this way, by a side view camera also without
It is upper surface or lower surface that method, which distinguishes defect point,.By equation provided above oval image inverting at circular diagram
Picture checks that the bright spot on circle of inversion image arrives the distance in the center of circle, then with top view camera obtain in round picture bright spot to the center of circle away from
From being compared, the changed defect for belonging to lower surface of every distance to the center of circle constant belongs to lacking for upper surface
It falls into.After having distinguished defect upper and lower surfaces of, you can the finish grade of upper and lower surface can be calculated separately out by calculating.
The application is explained so that part to be checked is round, when part to be detected is other shapes, specific detection side
Method with it is circular identical.
The unmentioned technology of the utility model is with reference to the prior art.
The utility model detects the device of transparent parts surface defect automatically, it can be achieved that automatic inspection to transparent parts defect
It surveys, and the face where defect can be distinguished, that is, be suitable for planar part, be also suitable for non-flat surface parts.
Description of the drawings
Fig. 1 is black glass tray structure diagram in embodiment 1；
Fig. 2 is the vertical view of Fig. 1；
Fig. 3 is the apparatus structure schematic diagram that embodiment 1 detects transparent parts surface defect automatically；
Fig. 4 is the imaging schematic diagram of top view camera and side view camera in embodiment 1；
Fig. 5 is black aluminium alloy tray structure diagram in embodiment 2；
Fig. 6 is the vertical view of Fig. 5；
Fig. 7 embodiments 2 detect the apparatus structure schematic diagram of transparent parts surface defect automatically；
Fig. 8 is the imaging schematic diagram of top view camera and side view camera in embodiment 2；
In figure, 101, part to be checked (circle)；102, black glass pallet；103, the restricted area (embodiment 1 that sample is placed
In pallet edge, the object placing platform rank in embodiment 2)；201, top view camera；202, side view camera；203, lighting source；302
For black aluminium alloy pallet；
Specific implementation mode
The utility model in order to better understand furthers elucidate the content of the utility model with reference to embodiment, but
The content of the utility model is not limited solely to the following examples.
As shown in figures 1-8, the device of transparent parts surface defect is detected automatically, including：Pallet, top view camera, side view phase
Machine and lighting source；Pallet center is equipped with detection zone, and detection zone is circle；Top view camera is arranged in the surface of detection zone；Side
It is arranged in the top of detection zone depending on camera, and the angle between top view camera and side view camera is 5-25 °；Lighting source setting exists
The top of detection zone, and the angle between top view camera and lighting source is more than the angle between top view camera and side view camera；
Illuminating ray from lighting source, either direct projection still reflect, and cannot enter top view camera and side view camera, relative to
For top view camera and side view camera, the effect of a dark-ground illumination is formed, it is preferable that the incident angle of lighting source to detection zone
It is 50-90 °；Pallet is made by black glass, detection zone surface darkly color mirror surface structure；Alternatively, pallet is by black aluminium alloy system
Make, pallet is equipped with through-hole as detection zone, and through-hole inner surface is equipped with object placing platform rank.
Further include XY displacement platforms, it is flat that pallet is located at XY displacements it is preferred that detecting the device of transparent parts surface defect automatically
On platform.
Embodiment 1：Minute surface pallet adds just oblique double camera scheme
The black glass pallet 102 of Fig. 1 is manufactured using using black glass, and a circular pit is dug on black glass and is used
In placing part 101 to be checked, the bottom of pit must be polished to minute surface.These pits are arranged in the two-dimensional array of N × N, and N is whole
Number.Optical element to be measured forms inverted image imaging (Fig. 3) on the minute surface of tray bottom.In the surface of part to be measured, installation one
A top view camera 201, in place installation one side view camera 202 of 201 side of top view camera apart from certain angle, in side view phase
The farther place installation orientable lighting source 203 in 202 side of machine, this structure design need to reach following optical effect：From light
The illuminating ray in source 203, either direct projection still reflect, and cannot enter top view camera 201 and side view camera 202, relative to
For two cameras, the effect of a dark-ground illumination is formed.One optical element of one-time detection, passes through the side of XY platform scanners
Formula realizes efficient batch detection.
Assuming that tray surface is completely flawless, at this point, if the upper and lower surface of optical element to be measured (circle) is also complete
There is no defect entirely, then from 202 the image collected of top view camera 201 and side view camera will be respectively a perfect dark circles
Spot and black ellipse spot (Fig. 4).When optical element upper surface to be measured is there are when fault B, it can be in the mirror relative to tray bottom
Face forms the virtual image (Fig. 3) B '.When optical element lower surface to be measured is there are when fault A, it then will not be relative to tray bottom
The minute surface in portion forms a virtual image, and the image acquired in top view camera 201 is still a black round spot, but can increase by two
Bright spot, corresponds to the defect B, wherein defect point B and its virtual image B ' of the defect A and upper surface of lower surface due to projection relation,
It is a point B/B ' that top view camera 201, which is obtained and then overlapped in image, and it is that defect cannot be distinguished to actually depend upon top view camera 201
It is upper surface or lower surface, in the image acquired in side view camera 202, due to projection relation, then along inclined direction
Size is compressed according to cosine rule, and is then uncompressed perpendicular to the size of inclined direction, and black ellipse spot is obtained, i.e., as follows
Cosine projection relationship
L⊥=L‖cosθ
W⊥=W‖cosθ
W represents width, and L represents length；And ⊥ and ‖ then indicate two mutually perpendicular directions.In black ellipse spot background
Upper there are three bright spots, correspond to lower surface defect point A, upper surface defect point B and its virtual image B ', in this way, relying solely on one respectively
It is upper surface or lower surface that side view camera 202, which can distinguish defect point, therefore, all along side view camera inclined direction
The bright spot that two striking resemblances of upper appearance occur in pairs, this defect is upper table planar defect；The bright spot of other non-paired appearance, then
It is the defect of lower surface.After having distinguished defect point upper and lower surfaces of, B ' virtual image points are disposed, and by provided above
Oval image inverting at circular image, can be calculated separately out the finish grade of upper and lower surface by formula.
Embodiment 2：Hollow out pallet adds just oblique double camera scheme
The pallet 302 of Fig. 5 is manufactured using using nigrescence aluminium alloy, and a circular through hole is dug on black aluminium alloy and puts object
Step is for placing optical element 101 to be detected, and for these arrays of openings at the two-dimensional array of N × N, N is integer.In part to be measured
Surface, install a top view camera 201 for neglecting rink corner, 201 side of top view camera apart from certain angle place peace
A side view camera 202 is filled, in the farther place installation orientable lighting source 203 in 202 side of side view camera, this structure design
It may achieve following optical effect：Illuminating ray from light source 203, either direct projection still reflect, and cannot enter top view phase
Machine 201 and side view camera 202 form the effect of a dark-ground illumination for two cameras.One optics of one-time detection
Part realizes efficient batch detection by way of XY platform scanners.
Assuming that tray surface is completely flawless, at this point, if the upper and lower surface of optical element to be measured (circle) is also complete
There is no defect entirely, then from 202 the image collected of top view camera 201 and side view camera will be respectively a perfect dark circles
Spot and black ellipse spot (Fig. 8).Assuming that the upper surface of part to be measured is there are one defect point B, lower surface, there are one defect point A.
Accessory size to be measured less big (such as 1 inch) when, the image acquired in top view camera 201 is still a black round spot, but
It is that can increase by two bright spots, corresponds to the defect B of the defect A and upper surface of lower surface.It is nothing to actually depend upon top view camera 201
It is upper surface or lower surface that method, which distinguishes defect,.In the image acquired in side view camera 202, due to projection relation, then edge
The size of inclined direction is compressed according to cosine rule, and is then uncompressed perpendicular to the size of inclined direction, and it is ellipse to obtain black
Round spot, i.e., following cosine projection relationship
L⊥=L‖cosθ
W⊥=W‖cosθ
W represents width, and L represents length；And ⊥ and ‖ then indicate two mutually perpendicular directions..In black ellipse spot background
On also there are two bright spot, correspond to lower surface defect point A, upper surface defect point B respectively.In this way, by a side view camera 202
Also it is upper surface or lower surface that defect point, which cannot be distinguished,.By equation provided above oval image inverting at circle
Image checks that the bright spot on circle of inversion image arrives the distance in the center of circle, then obtains the round bright spot as in the center of circle with top view camera
Distance is compared, the changed defect for belonging to lower surface of every distance to the center of circle, the constant upper surface that belongs to
Defect.After having distinguished defect upper and lower surfaces of, you can the finish etc. of upper and lower surface can be calculated separately out by calculating
Grade.
Claims (7)
1. a kind of device of automatic detection transparent parts surface defect, it is characterised in that：Including：Pallet, top view camera, side view phase
Machine and lighting source；
Pallet is equipped with detection zone；Top view camera is arranged in the surface of detection zone；Side view camera is arranged in the top of detection zone,
And the angle between top view camera and side view camera is not zero；Lighting source is arranged in the top of detection zone, and top view camera and
Angle between lighting source is more than the angle between top view camera and side view camera；
Pallet is made by black material；Detection zone surface darkly color mirror surface structure, alternatively, pallet is equipped with through-hole as detection
Area, through-hole are equipped with object placing platform rank.
2. the device of automatic detection transparent parts surface defect as described in claim 1, it is characterised in that：Pallet is by black glass
Glass makes, detection zone surface darkly color mirror surface structure；Alternatively, pallet is made by black aluminium alloy, pallet is equipped with through-hole conduct
Detection zone, through-hole are equipped with object placing platform rank, and object placing platform rank is located at through-hole inner surface.
3. the device of automatic detection transparent parts surface defect as claimed in claim 2, it is characterised in that：When pallet is by black
When glass makes, detection zone is recessed by tray upper surface and is formed.
4. the device of automatic detection transparent parts surface defect as described in claim 1, it is characterised in that：Detection zone is located at support
The center of disk, detection zone are circle；Angle between top view camera and side view camera is 5-25 °.
5. the device of automatic detection transparent parts surface defect as described in claim 1, it is characterised in that：From lighting source
Illuminating ray detection zone is irradiated in a manner of glancing incidence.
6. the device of automatic detection transparent parts surface defect as described in claim 1, it is characterised in that：The photograph of lighting source
The incident angle of Mingguang City's line to detection zone is 50-90 °.
7. the device of automatic detection transparent parts surface defect as described in claim 1, it is characterised in that：Further include XY displacements
Platform, pallet are located on XY displacement platforms.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721691930.1U CN207662807U (en) | 2017-12-07 | 2017-12-07 | A kind of device of automatic detection transparent parts surface defect |
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| CN201721691930.1U CN207662807U (en) | 2017-12-07 | 2017-12-07 | A kind of device of automatic detection transparent parts surface defect |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107764834A (en) * | 2017-12-07 | 2018-03-06 | 南京波长光电科技股份有限公司 | A kind of device and its detection method of automatic detection transparent parts surface defect |
| CN112986258A (en) * | 2021-02-09 | 2021-06-18 | 厦门威芯泰科技有限公司 | Surface defect detection device and method for judging surface where surface defect is located |
-
2017
- 2017-12-07 CN CN201721691930.1U patent/CN207662807U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107764834A (en) * | 2017-12-07 | 2018-03-06 | 南京波长光电科技股份有限公司 | A kind of device and its detection method of automatic detection transparent parts surface defect |
| CN112986258A (en) * | 2021-02-09 | 2021-06-18 | 厦门威芯泰科技有限公司 | Surface defect detection device and method for judging surface where surface defect is located |
| CN112986258B (en) * | 2021-02-09 | 2023-12-22 | 厦门威芯泰科技有限公司 | Surface defect detection device and method for judging surface where surface defect is located |
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