CN101377467B - Edge sensor and flaw detection apparatus - Google Patents
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Abstract
The invention provides an edge sensor and defect inspection device capable of reliably detecting breach, crack, or the like defects produced in transparent or semitransparent objects. When inventive edge sensor detects the edge position of transparent body or semitransparent body located in a parallel monochromatic light from the output of line type sensor formed by a plurality of light sensitive units arranged in a specified spacing, the edge sensor start to search the output of the line type sensor from free-space side, detects a first detection position where the luminous quantity drops to the first luminous quantity threshold in a luminous quantity distribution pattern produced by the edges of the object, and then detects a second detection position where the luminous quantity further drops to a second luminous quantity threshold value. So that the breach, crack, or the like defects are detected by variations of the first and second detection positions during scanning checkpoints along the edge.
Description
Technical field
The present invention relates to be suitable for breach and cracking edge sensor that detects and the flaw detection apparatus that uses this edge sensor to the edge of for example liquid-crystalline glasses.
Background technology
The application inventor had before had a motion; Be conceived to the Fresnel diffraction of the monochromatic collimated beam of object edge; Through analyze using a plurality of photosensitive units to arrange the detected light quantity distribution pattern of linear sensor that forms, detect the marginal position (with reference to No. 3858994 communique of Jap.P.) of above-mentioned object accurately with the precision more than the arrangement pitch of the photosensitive unit of above-mentioned linear sensor by predetermined distance.
And, also proposed through being conceived to the technical scheme (2007-No. 64733 communiques of reference example such as TOHKEMY) that above-mentioned Fresnel diffraction detects accurately its marginal position to the transparent body, translucent bodys such as liquid-crystalline glasses.
But in a single day Vitrea edge exists breach or cracking, just can receive the catoptrical influence of the above-mentioned breach and the rejected region that cracking causes of vitreum inside.Therefore, be difficult to correctly detect this edge from the light quantity distribution pattern of above-mentioned Fresnel diffraction.And, even if move the Vitrea marginal position that linear sensor detects marginal existence breach or cracking, also be difficult to clearly detect the variation of marginal position along this edge.Therefore, also be difficult to confirm to produce in the vitreum rejected region of breach or cracking.
Summary of the invention
The present invention considers above-mentioned situation just; Its purpose is to provide a kind of edge sensor of the above-mentioned object edge of the light quantity distribution pattern detection position that Fresnel diffraction produced from object edge, especially can reliable detection goes out the edge sensor of defectives such as the breach that produces such as this transparent or semitransparent object of liquid-crystalline glasses or cracking.
Simultaneously, its purpose of the present invention is, provides a kind of and can use above-mentioned edge sensor, detects the flaw detection apparatus of rejected regions such as the breach that produces such as this transparent or semitransparent object of liquid-crystalline glasses or cracking accurately.
In order to achieve the above object, edge sensor of the present invention comprises: a plurality of photosensitive units are arranged the linear sensor that forms with predetermined distance; With the light source of monochromatic collimated beam towards this linear sensor projection; And the output of said linear sensor analyzed the operational part that comes its ad-hoc location of object (edge) to the light path that is arranged in said monochromatic collimated beam to detect, it is characterized in that,
Said operational part comprises:
(A) primary importance detection means, the position that light quantity dropped to the first light quantity threshold value when it will be to the light quantity distribution pattern that the edge produced of transparent or semitransparent object be searched for towards the other end from the one of which end is obtained as first detection position of said object;
(B) second place detection means, it will be obtained as second detection position of said object from the position that increases to the second light quantity threshold value after the detected first detection position light quantity further descends,
The said first light quantity threshold value and the said second light quantity threshold value according to detect the edge when not having the detection position of transparent or semitransparent object of defective the light quantity of marginal portion fall degree and set.
In addition, can set respectively for the said first and second light quantity threshold values, also can be used as equal values provides.
Flaw detection apparatus of the present invention is characterized in that, constitutes the edge sensor with above-mentioned formation, comprising:
(a) scanning means, it makes the said linear sensor in the said edge sensor move along the edge of said transparent or semitransparent object, or make transparent or semitransparent object with said edge sensor in the direction that intersects of linear sensor on move; And
(b) defects detection means; Its scanning with said linear sensor or said object is kept watch on detected respectively first detection position of said first and second position detection means in the said edge sensor and the variation of second detection position, and when the variable quantity of first or second detection position surpasses pre-set threshold, carries out regulation such as give a warning and handle.
Another flaw detection apparatus of the present invention is characterized in that, constitutes the edge sensor with above-mentioned formation, comprising:
(c) shading width detection means, it is obtained detected respectively first detection position of said first and second position detection means in the said edge sensor and the difference of second detection position as the shading width;
(a) scanning means, it makes the said linear sensor in the said edge sensor move along the edge of said transparent or semitransparent object, or make transparent or semitransparent object with said edge sensor in the direction that intersects of linear sensor on move; And
(d) defects detection means, its shading width of said shading width detection means being obtained with the scanning of said linear sensor or said object is kept watch on, and when this shading width surpasses pre-set threshold, gives a warning.
In addition, also constituting said transparent or semitransparent object is glass plate, and said defects detection means detect breach or cracking or even the recess (making the big breach of edge line distortion) of above-mentioned glass plate edge and send and show the warning that has defective.
(invention effect)
Adopt the edge sensor of above-mentioned formation; From the light quantity distribution pattern that the edge produced of object, detecting its light quantity, to drop to light quantity with free space be first detection position (for example marginal position) of the position (position of bigger variation takes place light quantity) of the first light quantity threshold value confirmed of benchmark as said object; And above-mentioned object is transparent or semitransparent; Therefore be that second detection position of the second definite light quantity threshold value of benchmark detects with the light quantity that object side the produced big variation portion of comparing with first detection position that detects as stated as increasing to light quantity with free space after further descending from the above-mentioned first detection position light quantity, so can judge whether the edge of above-mentioned object exists defective according to the relation of above-mentioned two detection positions.
Specifically; Under the situation of defectives such as the marginal existence breach of object, cracking; The transmittance effect of transparent or semitransparent interior of articles changes because of these defectives; Its light quantity distribution pattern is just different with the light quantity distribution pattern that normal edge produced that does not have defective, thereby can be easy to judge according to above-mentioned two detection positions the variation of this light quantity distribution pattern.Therefore, can be easy to judge according to the relation of above-mentioned two detection positions whether object edge exists defective.
And adopt flaw detection apparatus of the present invention; The edge of the above-mentioned transparent or semitransparent object in above-mentioned linear sensor edge in the edge sensor is moved; Or make transparent or semitransparent object with above-mentioned edge sensor in the direction that intersects of linear sensor on move and obtain above-mentioned first and second detection positions respectively; Obtain the trend of the above-mentioned detection position that detects; Thereby can detect breach or cracking defect from the variation of above-mentioned two detection positions, and the detection location information (scanning position information) that can be easy to the above-mentioned detection position when detecting defective is confirmed this defective position.
So, can be conceived to the variation of the light quantity distribution pattern at its edge of transparent or semitransparent object, simple and easy and detect the defective such as breach or cracking of the marginal existence of above-mentioned object effectively, thereby bigger with advantage in fact.
Description of drawings
Fig. 1 is illustrated to be the formation substantially of the edge sensor and the defect detecting device of an embodiment of the present invention.
Fig. 2 is illustrated to be the light quantity distribution pattern and the detected detection position of the above-mentioned edge sensor relation between the two of linear sensor.
Fig. 3 is illustrated be the light quantity distribution pattern its have or not defective and this defect kind with the edge and the variation contrast that changes to some extent.
Situation that to be first and second detection positions change with the scanning of inspection area that Fig. 4 is illustrated.
Fig. 5 is illustrated to be first and second detection positions with respect to the amount of movement of edge sensor or translucent body and situation about changing.
(label declaration)
10 edge sensors
11 linear sensors
12 light sources
13 optical heads
14 arithmetical unit (CPU)
15 primary importance detection meanss
16 second place detection meanss
21 scanning means (scanning mechanism)
22 defects detection means (tendency judgement means)
23 storeies
Embodiment
Explain with reference to the accompanying drawings an embodiment of the present invention edge sensor, use the defect detecting device of this edge sensor.
Fig. 1 is that the output that detects edge sensor 10 such as the ad-hoc location (for example marginal position) of transparent or semitransparent object A such as liquid-crystalline glasses, keeps watch on above-mentioned edge sensor 10 when utilizing the position probing object position of 10 couples of above-mentioned object A of this edge sensor to scan detects the cardinal principle pie graph that flawless defect detecting device is arranged among the above-mentioned object A.
This edge sensor 10 comprises following formation: optical head 13, and its linear sensor 11 that a plurality of photosensitive units are formed by line spread with predetermined distance separates predetermined distance with the light source 12 that monochromatic collimated beam is throwed towards this linear sensor 11 and disposes relatively; And arithmetical unit 14, the ad-hoc location (for example marginal position) of the object A that puts in the light path that detects above-mentioned monochromatic collimated beam is analyzed in its output to above-mentioned linear sensor 11.
In addition, the basic structure of optical head 13 (formation) is well-known as that kind that No. 3858994 communique of above-mentioned patent and 2007-No. 64733 communiques of TOHKEMY etc. are disclosed.In addition, the scanning at the position probing object position of 10 couples of above-mentioned object A of above-mentioned edge sensor is to carry out through above-mentioned linear sensor 11 (optical head 13) in the above-mentioned edge sensor 10 is moved along the edge of above-mentioned transparent or semitransparent object A.Perhaps make on the contrary above-mentioned transparent or semitransparent object A with above-mentioned edge sensor 10 in the direction that intersects of linear sensor 11, the direction that particularly intersects with the orientation of a plurality of photosensitive units on move and carry out this scanning.
And above-mentioned arithmetical unit 14 is realized by for example CPU, has the function 15,16 that light quantity distribution pattern on the above-mentioned linear sensor 11 that the edge of above-mentioned object A is produced according to the output of this linear sensor 11 is analyzed the ad-hoc location of calculating above-mentioned object A (for example comprise marginal position in interior first and second detection positions of explanation after a while).Here, in general above-mentioned light quantity distribution pattern is the pattern of the Fresnel diffraction of above-mentioned monochromatic collimated beam generation.
In addition; When above-mentioned arithmetical unit 1 constitutes its sensitive volume at the free space that is not covered by above-mentioned object A basically of above-mentioned linear sensor 11 is normalized to " 1 ", its sensitive volume of rising edge part of above-mentioned light quantity distribution pattern is detected for the detection position (marginal position) as above-mentioned object A, the position of " 0.25 ".In other words, to constitute on the light quantity distribution pattern of above-mentioned Fresnel diffraction its light quantity be that the position of the definite regulation light quantity threshold value " 0.25 " of benchmark detects as the ad-hoc location (marginal position) of object A for the light quantity " 1 " with the free space place to above-mentioned arithmetical unit 14.
Among the present invention; Object A as detected object is transparent or semitransparent; Therefore be conceived to such situation; The output that is above-mentioned linear sensor 11 is as shown in Figure 2, not only do not have the sensitive volume of the free space that object A exists more, and the residing part of above-mentioned object A is because the monochromatic collimated beam of this object of transmission A arrives linear sensor 11 thereby its sensitive volume is also more.And object A is under the situation of occulter, and the marginal portion sensitive volume does not have great decline, but object A is under the transparent or semitransparent situation, and only the influence because of Fresnel diffraction causes its sensitive volume that reduction is to a certain degree arranged in the marginal portion of object A.And under the situation of defectives such as the marginal existence breach of above-mentioned object A or cracking, can receive the influence of diffraction at random, refraction or even diffuse reflection etc. of the above-mentioned monochromatic collimated beam of this defect part.In this case, produce the contrast of Fresnel diffraction with the edge (knife edge) of linearity, above-mentioned sensitive volume descend (fall! Luo ち Write む)) width at position enlarges.
Specifically; As Fig. 3 (a)～Fig. 3 (d) shown in respectively to detect transparent substance be the detection position of liquid-crystalline glasses with optical head 13 time linear sensor 11 output such, whether the distribution patterns of its sensitive volume exists defective to produce difference with the edge of above-mentioned liquid-crystalline glasses.Fig. 3 (a) is the photosensitive profile pattern that does not have the marginal portion of defective existence; Fig. 3 (b) is the photosensitive profile pattern of marginal portion when having small breach; Fig. 3 (c) is the distribution patterns of marginal portion when having cracking, and the distribution patterns during Fig. 3 (d) to be the marginal portion exist recess that breach causes.
The visible that kind of sensitive volume distribution patterns shown in Fig. 3 (a)～Fig. 3 (d) difference; Compare with the situation that the edge of object A does not have defective to exist; Exist the light quantity of the situation lower limb part of defectives such as breach or cracking to fall increase, and the width that light quantity is fallen enlarge.No matter but the detected light quantity falling position of free space side has zero defect all almost not change.And its falling position of the detected light quantity of object side has bigger variation with defect kind, its degree, and it falls mode (light quantity change pattern) various variations also take place.The detection position exists under the situation of defective, lets the wide sensitive volume that causes position its object A side of even transmission that bigger inequality is arranged originally.
Therefore; Edge sensor 10 of the present invention constitutes has primary importance detection means 15 and second place detection means 16; When the free space side of the never above-mentioned object A of output of 15 pairs of above-mentioned linear sensors 11 of primary importance detection means begins to search for; The Fresnel diffraction that produces with the edge of above-mentioned object A according to light quantity and the part that sharply descends is obtained the first detection position α of above-mentioned object A, and the position that second place detection means 16 will increase after will further descending from the first detection position α sensitive volume that this primary importance detection means 15 is obtained is again obtained as the second detection position β of above-mentioned object A.
In addition; In this embodiment, sensitive volume for example that is to say that from the position that the normalization light quantity " 1.0 " of free space side drops to " 0.825 " position that drops to the predefined first and second light quantity threshold values detects respectively as the above-mentioned first and second detection position α, β.Here, be equal values " 0.825 " for the first and second light quantity threshold settings, but also can be set at the value that differs from one another.And; In this embodiment; Particularly through beginning the output of above-mentioned linear sensor 11 is searched for from the free space side; No matter thereby the whether irregular variation of the sensitive volume that produces because of defective of object A side, can detect reliably respectively confirm with the corresponding sensitive volume in detection position (marginal position) of object A fall the part required first and second detection position α, β.Begin to search for good but constitute to the output of above-mentioned linear sensor 11 from object A side.And when carrying out sensitive volume normalization; Can measure the light quantity of free space under the state that object A is not set in advance stores; And when detecting, carry out normalization according to this value, perhaps handle the sensitive volume less zone that descends good as free space according to testing result.
Use by the information of the detection position (the first and second detection position α, β) of such edge sensor 10 detected object A to come the flaw detection apparatus that above-mentioned object A carries out defect inspection is comprised the scanning means (scanning mechanism) 21 that move the detected object position of 13 couples of object A of above-mentioned optical head detection position along the edge of this object A.These scanning means 21 can be to have the object supporting mechanism (not shown) that makes object A parallel mobile this function along its edge, also can be to make the edge parallel mobile optical head travel mechanism (not shown) of above-mentioned optical head 13 along above-mentioned object A on the contrary.That is to say, scanning means 21 can be make object A with direction that linear sensor 11 intersects on parallel moving, also can be make on the contrary linear sensor 11 along the edge of object A parallel moving.
Except such scanning means 21; Above-mentioned flaw detection apparatus also comprises defects detection means (tendency judgement means) 22; These defects detection means 22 are handled through the detection of carrying out 14 couples of above-mentioned first and second detection position α of above-mentioned arithmetical unit (CPU), β with the scanning at above-mentioned position probing object position one by one, and keep watch on the edge of inspected object A that defectives such as non-notch or cracking are arranged to the variation of its output (the first and second detection position α, β).In this embodiment; The above-mentioned edge sensor 10 detected first and second detection position α, β information once are stored in the storer 23, the change pattern (variation tendency) of first and second detection positions are read in the above-mentioned defects detection means 22 be used for defect inspection then.
And in the above-mentioned defects detection means (tendency judgement means) 22, when the for example amplitude of variation of the above-mentioned first detection position α or the second detection position β has surpassed predefined permission amplitude, it is judged to be " defectiveness ".There is the position in defect inspection position (scanning position) detection of above-mentioned object A in the time of will being judged to be " defectiveness " simultaneously for defective.To the permission amplitude of the amplitude of variation of the first detection position α or the second detection position β, can set according to the rectilinearity degree that object A edge is required.
Above-mentioned defects detection means (tendency judgement means) 22 also can detect the difference of for example above-mentioned first detection position α and the above-mentioned second detection position β width (shading width) that falls as the light quantity in the above-mentioned light quantity distribution pattern, and the variation of above-mentioned detection position α, β poor (light quantity fall width) is kept watch on when scanning above-mentioned object A edge.And when surpassing predefined permissible value, it is judged to be " defectiveness " when the difference of detection position (light quantity fall width).In this case, there is the position in defect inspection position (scanning position) detection of the above-mentioned object A in the time of also will being judged to be " defectiveness " for defective.Permissible value to the difference of above-mentioned detection position (light quantity fall width) can be set according to the rectilinearity degree that object A edge is required.
Like this; This flaw detection apparatus constitutes and utilizes above-mentioned edge sensor 10 that the detection position of transparent or semitransparent object A is detected respectively as the above-mentioned first and second detection position α, β, makes this position probing object position when this edge moves, keep watch on the situation of change (variation tendency) of the above-mentioned first and second detection position α, β.Thereby; When adopting this device to work as to detect the variation of the first and second detection position α, β to surpass predefined permissible value; Or the difference of first detection position α and the second detection position β is detected. as defectives such as object A marginal existence breach or cracking when having surpassed the permission amplitude reliably.Simultaneously, adopt this device to which position at object A edge to exist defectives such as breach or cracking to detect.
It is the situation of change of the example first and second detection position α, β when carrying out rim detection that Fig. 4 (a) illustrates with liquid-crystalline glasses jaggy.In this example, for the first detection position α, almost can't see variation, but, then see bigger variation at the width range that is equivalent to barbed portion for the second detection position β.It is the situation of change of the example first and second detection position α, β when carrying out rim detection that Fig. 4 (b) then illustrates with the liquid-crystalline glasses that cracking is arranged.And in this example, for the first detection position α, also almost can't see variation, but for the second detection position β, then see bigger variation at the width range of the part that is equivalent to ftracture.
And Fig. 4 (c) illustrates is that liquid-crystalline glasses with the jagged recess that causes is the situation of change of the example first and second detection position α, β when carrying out rim detection.In this example, for the first detection position α, can see variation slightly, but, then see bigger variation at the width range that is equivalent to the recess position for the second detection position β at the recess position.Fig. 5 (a)～Fig. 5 (c) is corresponding with Fig. 4 (a)～Fig. 4 (c) respectively, is the situation of change that transverse axis illustrates the first and second detection position α, β with the amount of movement of edge sensor 10 or translucent body A.Edge detection results is shown so also can be seen and the identical trend of situation of change shown in above-mentioned Fig. 4 (a)～Fig. 4 (c).
Therefore; As stated according to flaw detection apparatus of the present invention; Wherein adopt the present invention except the first detection position α that common edge sensor detected, also to detect the edge sensor 10 of the second detection position β; And the above-mentioned first and second detection position α during to scanning object A edge, the situation of change of β keep watch on, and just can reliable detection go out tiny flaws such as breach that the edge of object A such as liquid-crystalline glasses produces and cracking.But also can detect the position that above-mentioned defective belongs to, therefore have great practical advantages aspect the quality management of for example liquid-crystalline glasses.
And, hope to constitute detecting the execution compulsory exercise corresponding under the situation of defective with it.Compulsory exercise can be meant for example sends warning or this action command of alarm, perhaps constitute the removal device that object A is removed in the middle of the operation as substandard products is set in addition, and take certain means instruction that this is carried out should this content of removal processing.Thus, can be easy to tackle the product that has defective.
But in a single day the edge of object A exists defectives such as breach or cracking, just as with reference to Fig. 3 (a)～Fig. 3 (d) is illustrated, also can change at object A side sensitive volume.So; Do not having dirt on the transparent or semitransparent object A and can guarantee under the stable situation of the light quantity of this object A part (interior of articles); For example also can obtain the light quantity distribution shown in Fig. 3 (a) of the inner side of normal object A in advance, will compare with above-mentioned light quantity distribution as the light quantity distribution of the inner side of object A of inspection object and carry out defect inspection.The light quantity distribution of its private side of object A as the inspection object is tried to achieve shown in Fig. 3 (b)～Fig. 3 (d) respectively, when different, also can it be judged to be defectives such as having breach or cracking with the light quantity distribution of the normal object A shown in Fig. 3 (a).The method of this method and the variation of above-mentioned judgement second detection position is used in the lump, just can further be detected the tiny flaw at object A edge.
The present invention is not limited to above-mentioned embodiment.For instance; Be not specific for above-mentioned " 0.825 " to the first and second light quantity threshold values on the basis that detects the first and second detection position α, β, but according to detect the edge when not having the detection position of transparent or semitransparent object A of defective the light quantity of marginal portion fall degree and set and get final product.In addition, for the detection width of linear sensor 11, confirm to get final product according to linear sensor 11 and object A distance (operating distance) between the two etc.In addition, the present invention can carry out various distortion and implements in the scope that does not break away from its essence.
Claims (7)
1. an edge sensor comprises: the linear sensor that a plurality of photosensitive units form with the predetermined distance arrangement; With the light source of monochromatic collimated beam towards this linear sensor projection; And the output of said linear sensor analyzed the operational part that comes its edge of object to the light path that is arranged in said monochromatic collimated beam to detect, it is characterized in that,
Said operational part comprises primary importance detection means and second place detection means; The position that light quantity dropped to the first light quantity threshold value when said primary importance detection means will be to the light quantity distribution pattern that the edge produced of transparent or semitransparent object be searched for towards the other end from the one of which end is obtained as first detection position of said object; Said second place detection means will be obtained as second detection position of said object from the position that increases to the second light quantity threshold value after the detected first detection position light quantity further descends
The said first light quantity threshold value and the said second light quantity threshold value according to detect the edge when not having the detection position of transparent or semitransparent object of defective the light quantity of marginal portion fall degree and set.
2. edge sensor as claimed in claim 1 is characterized in that, said operational part is analyzed the light quantity distribution pattern on the said linear sensor from the free space side to the output search of said linear sensor.
3. a flaw detection apparatus is characterized in that, comprising:
The described edge sensor of claim 1;
The scanning means that said linear sensor in this edge sensor is moved along the edge of said transparent or semitransparent object; And
The defects detection means; First detection position that it is obtained respectively said first and second position detection means in the said edge sensor with the scanning of this linear sensor and the variation of second detection position are kept watch on, and when the variable quantity of first detection position or second detection position surpasses pre-set threshold, give a warning.
4. a flaw detection apparatus is characterized in that, comprising:
The described edge sensor of claim 1;
Shading width detection means, it is obtained detected respectively first detection position of said first and second position detection means in this edge sensor and the difference of second detection position as the shading width;
The scanning means that said linear sensor in the said edge sensor is moved along the edge of said transparent or semitransparent object; And
The defects detection means, its shading width of said shading width detection means being obtained with the scanning of said linear sensor is kept watch on, and when this shading width surpasses pre-set threshold, gives a warning.
5. a flaw detection apparatus is characterized in that, comprising:
The described edge sensor of claim 1;
Make said transparent or semitransparent object with said edge sensor in the direction that intersects of linear sensor on the scanning means that move; And
The defects detection means; Its variation with first and second detection positions that the scanning of said object is obtained respectively said first and second position detection means in the said edge sensor is kept watch on, and when the variable quantity of first or second detection position surpasses pre-set threshold, gives a warning.
6. a flaw detection apparatus is characterized in that, comprising:
The described edge sensor of claim 1;
Shading width detection means, it is obtained detected respectively first detection position of said first and second position detection means in this edge sensor and the difference of second detection position as the shading width;
Make said transparent or semitransparent object with said edge sensor in the direction that intersects of linear sensor on the scanning means that move; And
The defects detection means, its shading width of said shading width detection means being obtained with the scanning of said object is kept watch on, and when this shading width surpasses pre-set threshold, gives a warning.
7. like each described flaw detection apparatus in the claim 3 to 6, it is characterized in that said transparent or semitransparent object is a glass plate, said defects detection means are used to detect the breach or the cracking of said glass plate edge.
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| JP2007220931 | 2007-08-28 | ||
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| JP2008-177796 | 2008-07-08 | ||
| JP2008177796A JP5408915B2 (en) | 2007-08-28 | 2008-07-08 | Edge sensor and defect inspection device |
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| KR (1) | KR101004294B1 (en) |
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| TWI481852B (en) * | 2012-03-22 | 2015-04-21 | Hiti Digital Inc | Detecting device and method for detecting an edge of transparent material |
| JP2014077660A (en) * | 2012-10-09 | 2014-05-01 | Fuji Xerox Co Ltd | Detector |
| US20140261170A1 (en) * | 2013-03-15 | 2014-09-18 | Hiti Digital, Inc. | Methods for detecting an edge of a transparent material and detecting devices and systems for same |
| JP2015109948A (en) * | 2013-10-31 | 2015-06-18 | キヤノン株式会社 | Subject information acquisition device |
| KR101730039B1 (en) | 2014-12-03 | 2017-04-26 | 주식회사 케이엔제이 | apparatus for examining edge of flat panel display panel and method of using the same |
| US10088339B2 (en) | 2015-02-13 | 2018-10-02 | Azbil Corporation | Automated system and method for detecting defective edges of printed circuit boards and other objects using multiple sensors |
| CN105866137B (en) * | 2016-06-15 | 2018-11-30 | 秦皇岛可视自动化设备有限公司 | A kind of calendering tempered glass edge defect on-line measuring device and method |
| CN106098580A (en) * | 2016-06-29 | 2016-11-09 | 昆山国显光电有限公司 | A kind of liquid curtain bifurcated detection device and method |
| KR101872390B1 (en) * | 2017-03-16 | 2018-06-28 | 주식회사 포스코 | The position detecting apparatus of side trimmer having the same |
| KR101990639B1 (en) * | 2017-11-08 | 2019-06-18 | 주식회사 테스 | Substrate inspection method and Substrate processing apparatus |
| CN108746010A (en) * | 2018-05-24 | 2018-11-06 | 友达光电（昆山）有限公司 | A kind of cleaning system |
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| JP2009075078A (en) | 2009-04-09 |
| CN101377467A (en) | 2009-03-04 |
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| KR101004294B1 (en) | 2011-01-03 |
| KR20090023154A (en) | 2009-03-04 |
| JP5408915B2 (en) | 2014-02-05 |
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