CN103250047A - Method and system for measuring defect in glass ribbon - Google Patents
Method and system for measuring defect in glass ribbon Download PDFInfo
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- CN103250047A CN103250047A CN2011800594339A CN201180059433A CN103250047A CN 103250047 A CN103250047 A CN 103250047A CN 2011800594339 A CN2011800594339 A CN 2011800594339A CN 201180059433 A CN201180059433 A CN 201180059433A CN 103250047 A CN103250047 A CN 103250047A
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- 239000011521 glass Substances 0.000 title claims abstract description 223
- 230000007547 defect Effects 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title abstract description 46
- 230000002950 deficient Effects 0.000 claims description 263
- 238000012546 transfer Methods 0.000 claims description 86
- 238000012360 testing method Methods 0.000 claims description 29
- 238000006073 displacement reaction Methods 0.000 claims description 23
- 238000004364 calculation method Methods 0.000 claims description 10
- 238000003384 imaging method Methods 0.000 abstract 1
- 238000003556 assay Methods 0.000 description 36
- 238000010586 diagram Methods 0.000 description 31
- 238000012545 processing Methods 0.000 description 13
- 239000012467 final product Substances 0.000 description 11
- 230000005540 biological transmission Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000007429 general method Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- SIPNIVSCAYGONU-UHFFFAOYSA-N 4-[(7-oxo-6,8-dihydropyrrolo[2,3-g][1,3]benzothiazol-8-yl)methylideneamino]-N-pyridin-2-ylbenzenesulfonamide Chemical compound O=C1NC2=CC=C3N=CSC3=C2C1C=NC(C=C1)=CC=C1S(=O)(=O)NC1=CC=CC=N1 SIPNIVSCAYGONU-UHFFFAOYSA-N 0.000 description 1
- 238000006124 Pilkington process Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 210000000887 face Anatomy 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
- G01N21/892—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles characterised by the flaw, defect or object feature examined
- G01N21/896—Optical defects in or on transparent materials, e.g. distortion, surface flaws in conveyed flat sheet or rod
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- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
- Length Measuring Devices By Optical Means (AREA)
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Abstract
Provided is a method for measuring a defect in a glass ribbon, which makes it possible to measure the position of a defect in a glass ribbon in the height direction even when the defect is located closed to an interface of the glass ribbon or the defect is large. A circumscribing rectangle is specified for two overlapping images from among pictures obtained by imaging a glass ribbon being transported. A height (h) in real space corresponding to a side (24) of the circumscribing rectangle is then calculated. Furthermore, a height in real space corresponding to the distance from a center region (21a) of an image (21) from among the pictures to the closest short side is calculated, and a length (s) that is twice said height is calculated. Thereafter, h - s is calculated to obtain a movement distance (yd) of a defect from the position where a first image is captured to the position where a second image is captured, and the position of the defect in the height direction is calculated using the movement distance (yd) and an angle of refraction (beta).
Description
Technical field
The present invention relates in a kind of glass tape that carries out the mensuration relevant with defective in the glass tape defect testing system in the defect testing method and glass tape, relate in the glass tape of measuring a kind of short transverse position to the defective in the glass tape etc. defect testing system in the defect testing method and glass tape especially.
Background technology
Propose various short transverse positions to the defective in the glass tape etc. and carried out method for measuring.
As the general method that the short transverse position of the defective in the glass tape is measured, the focus of regulating camera when existence is taken defective is measured the method for the short transverse position of defective.For convenience this method is called first assay method.Figure 10 A is the key diagram of schematically representing first assay method.In first assay method, shown in Figure 10 A, make light pass through to transmit under the state of glass tape 82 glass tape 82.And, utilize the inside of 81 pairs of glass tapes that are transmitted 82 of line camera to take.If have defective 83 in the inside of glass tape 82, then defective 83 is taken.Figure 10 B represents the example of the image of the defective that photographs.In Figure 10 A, schematically represent defective 83 with rectangle, in Figure 10 B, also be illustrated in the picture 86 of the defective that occurs in the image of glass tape with rectangle, but the shape of defective is not limited to rectangle.Wherein, in Figure 11 A shown below, Figure 11 B, Figure 12 A, Figure 12 B, Figure 13 and Figure 14, also schematically represent defective with rectangle.In addition, the arrow shown in Figure 10 B is the direction of transfer of glass tape 82.When the inside that utilizes 81 pairs of glass tapes 82 of line camera is taken, regulate the focus of camera, make the location of defective consistent with the focus of camera, measure the absolute distance from line camera 81 to defective, according to this short transverse position apart from the calculating defective.Make the location method consistent with the focus of camera of defective as the focus of regulating camera, have DFF (Depth from Focus: the depth of focus) method etc.In addition, about the size of defective, the image that photographs is carried out the size that image handles to measure defective.
For example in patent documentation 1～3 grade, put down in writing the focus of regulating camera and measured method, the device of the short transverse position of defective.
In addition, as other the general method that the short transverse position of the defective in the glass tape is measured, there is following method: utilize the reflection of light light that incides glass tape, take same defective two positions, concern to measure the short transverse position of defective according to the position as resulting two pictures of its result.For convenience this method is designated as second assay method.Figure 11 A is the key diagram of schematically representing second assay method.In second assay method, for example shown in Figure 11 A, make with the line camera identical side incident of light in glass tape 82, make its reflected light arrive line camera 81.Then, transmit glass tape 82, utilize the inside of 81 pairs of glass tapes 82 of line camera to take.To with reference to the side view shown in the top of Figure 13 the path of light in glass tape be described in the back.For defective 83, glass tape 82 be transmitted and mobile and this defective 83 and reflection before the path overlap of light the time and with reflect after the path overlap of light the time, be captured as picture in the online camera 81 respectively.Consequently, even defective 83 is one, two pictures of also appearing before one's eyes in the image that photographs.Figure 11 B is the example of the image that photographs by second assay method.Shown in Figure 11 B, for same defective two pictures 84,85 of appearing before one's eyes.In second assay method, concern to calculate the short transverse position of defective 83 according to the position of two pictures in the exemplified image of Figure 11 B.In addition, about the size of defective, the image that photographs is carried out the size that image handles to measure defective.In addition, the arrow shown in Figure 11 B is the direction of transfer of glass tape 82.
Method, device below for example in patent documentation 4～6,8 etc., having put down in writing: utilize the reflection of light light that incides transparency carrier etc., take same defective two positions, concern to measure the short transverse position of defective according to the position of two pictures.
In addition, have following method: on the two sides of glass tape, similarly image is taken with second assay method, the position of the picture in the image that photographs according to each face at glass tape concerns to measure the short transverse position of defective.For convenience this method is designated as the 3rd assay method.Figure 12 A is the key diagram of schematically representing the 3rd assay method.In the 3rd assay method, for example shown in Figure 12 A, make light in glass tape 82 with the first line camera 81
aAn identical side incident makes its reflected light arrive the first line camera 81
aSimilarly, make light with the second line camera 81
bAn identical side incident makes its reflected light arrive the second line camera 81
bThen, transmit glass tape 82, utilize the first line camera 81
aWith the second line camera 81
bRespectively the inside of glass tape 82 is taken.Like this, at the first line camera 81
aIn, similarly catch two pictures with the situation of second assay method.In addition, at the second line camera 81
bIn also catch two pictures.Figure 12 B is the example of the image that photographs by the 3rd assay method.In the 3rd assay method, shown in Figure 12 B, the image that the image that the line camera that obtains a side photographs from the upside of glass tape and the line camera of opposite side photograph from the downside of glass tape.Two pictures of in each image, appearing before one's eyes respectively.In the 3rd assay method, the short transverse position that the position of the picture each image that photographs according to upside and downside from glass tape concerns to calculate defective 83.In addition, in Figure 12 B, example the image that photographs from upside the overlapping situation of picture.In addition, about the size of defective, the image that photographs is carried out the size that image handles to measure defective.In addition, the arrow shown in Figure 12 B is the direction of transfer of glass tape 82.
For example in patent documentation 7, put down in writing the method for obtaining the short transverse position of defective from the both sides photographic images of transparency carrier.
In second assay method, the 3rd assay method, not overlapping in image with the picture of same defective is the short transverse position that condition is calculated defective.In addition, in the 3rd assay method, as Figure 12 B is exemplified, in the image of a side, under the overlapping situation of picture, using the short transverse position of the image calculation defective of opposite side to get final product.
Below, the object lesson that position according to two pictures in the image that photographs in second assay method concerns to measure the short transverse position of defective is shown.Figure 13 is the key diagram of the position of expression when utilizing the line camera that the defective in the glass tape that is transmitted is taken.Figure shown in the top of Figure 13 is the side view of glass tape, and the figure shown in the lower left side of Figure 13 is the corresponding vertical view of side view shown in the top with Figure 13.The image that obtains when in addition, illustrating shown in the right side, bottom of Figure 13 taken defective 83 in the glass tape 82 be transmitted.
Rectangle shown in side view shown in Figure 13 and the vertical view is represented the defective 83 in the glass tape 82.Defective is one in the present example.A defective 83 is mobile with the glass tape 82 that is transmitted.In side view and vertical view shown in Figure 13, the defective 83 when illustrating the defective 83 when moving to position 91 respectively and moving to position 92.Be not to have two defectives in side view shown in Figure 13 and vertical view.
Like that, the face that arrive the line photograph pusher side of light from glass tape 82 of line camera 81 incides the glass tape 82 that is transmitted shown in the side view on the top of Figure 13.And when the light after the incident arrived the interface of the side opposite with light incident side in the glass tape 82, at this boundary reflection, the interface by light incident side arrived line camera 81.The incident angle α that arrives the light of line camera 81 depends on the position that arranges of line camera 81.By the position that arranges of static line camera 81, incident angle α is decided to be fixed value.In addition, depend on the refractive index n of the incident angle α of light and glass tape 82 and determine the refraction angle β of light.At this, suppose that incident angle α and refractive index n are known, refraction angle β also is decided to be fixed value.For refractive index n, incident angle α and refraction angle β, the relation of formula (1) is set up.
N=sin α/sin β formula (1)
Thereby, if incident angle α and refractive index n are known, then β are found the solution formula (1) and obtains refraction angle β.
In addition, in example shown in Figure 13, the face of the side opposite with line camera 81 from glass tape 82 is determination objects to the short transverse position d of defective 83.
In addition, have in defective 83 under the situation of light transmission, the light that has seen through defective 83 arrives line camera 81 and is captured as picture.Be that defective 83 is appeared before one's eyes in image and is the picture of black under the situation of defective of light-proofness in defective 83.Whether defective tube 83 does not have light-proofness, is all moving to position 91, is being captured as picture at 92 o'clock.
In addition, as shown in figure 13, establishing from the displacement of the defective 83 of the camera site 92 of camera site 91 to second pictures of first picture is y
dIn addition, the scope with the camera site of the frontal of line camera 81 is called center line 95.More particularly, are center lines 95 with the scope orthogonal projection of the camera site of the frontal of line camera 81 to the straight line of the interface gained of glass tape 82.In the image that photographs (with reference to the right side, bottom of Figure 13), can be according to measuring y with first as 98 and second the distance as 98,99 during as the line 96 of 99 orthogonal projections in the image that is equivalent to center line 95
d
If go out y according to determining image
dValue, then can use refraction angle β to obtain the short transverse position d of defective 83 by calculating formula (2) shown below.
D=y
d/ (2 * tan β) formula (2)
In addition, will be made as θ to the straight line of the interface gained of glass tape with the angle of 95 one-tenth of center lines towards the straight line orthogonal projection of the camera site 91 of first picture from line camera 81.At this moment, in the image that photographs (with reference to the right side, bottom of Figure 13), also be θ with second straight line as each center of 99 with the angle of 96 one-tenth on line as 98 by first.In addition, at this moment can calculate tan θ as follows.Below, at the y shown in the vertical view of the lower left side that Figure 13 is described
cThe basis on, the calculating of tan θ is described.
Figure 13 illustrates the situation that defective 83 departs from from the front of line camera 81.Supposing that as shown in Figure 14 defective 83 is present under the situation in front of line camera 81, is called shooting distance y to the position at the interface of glass tape 82 and the camera lens part orthogonal projection of line camera 81 to the distance between the position at the interface of glass tape 82 with position 92 orthogonal projections of taking second picture
cWherein, shooting distance y
cShort transverse position d according to defective 83 changes.When d was maximum, shooting distance was minimum value y
1, at d for hour, shooting distance y
cBe maximal value y
2(with reference to the side view shown in the top of Figure 14).That is y,
1≤ y
c≤ y
2Like this, y
cDepend on d strictly speaking, but for example also can be at y
1≤ y
c≤ y
2Scope in be predetermined y
cEven yc is not correct value, so long as y
1≤ y
c≤ y
2Scope in value, then in tan θ, only comprise insignificant error.
In addition, defective 83 is designated as x from departing from of producing of the frontal of line camera
Cc(with reference to the lower left side of Figure 13).Can be in the image that photographs (with reference to the right side, bottom of Figure 13), according to determining x from the line 96 to second that is equivalent to center line 95 as 99 distance
CcThat is, in image, count as the pixel count of 99 distance from line 96 to second being equivalent to.The position of line camera 81 is fixed, and therefore the distance in real space of each pixel can also be determined be fixed value.Multiply each other as the pixel count of 99 distance and the distance real space of each pixel from line 96 to second by will being equivalent to, can calculate x
CcLength.
At this, can use y
cAnd x
Cc, shown in following formula (3), represent tan θ with approximate expression like that.That is, can use y
cAnd x
Cc, obtain tan θ by calculating formula (3).
In addition, the method below in patent documentation 8, having put down in writing: make light incide glass plate while glass plate is moved, utilize its incident light and reflected light to detect defective, the short transverse position of computing defective.In the method that patent documentation 8 is put down in writing, at the pattern that detects defective and do not have at the moving direction of glass plate under the situation of pattern of same size, namely, under near the situation that has defective the back side of glass plate or under the big situation of defective, be 0 with the short transverse location determination of this defective.Therefore, in the method that patent documentation 8 is put down in writing, can't correctly obtain the position of the short transverse of defective in these cases.
Patent documentation 1: TOHKEMY 2001-305072 communique
Patent documentation 2: TOHKEMY 2004-361384 communique
Patent documentation 3: TOHKEMY 2008-76071 communique
Patent documentation 4: No. 2920056 communique of Jap.P.
Patent documentation 5: Japanese kokai publication hei 9-61139 communique
Patent documentation 6: Japanese Unexamined Patent Application Publication 2003-508786 communique
Patent documentation 7: international disclosing No. 2006/057125
Patent documentation 8: TOHKEMY 2010-8177 communique
Summary of the invention
The problem that invention will solve
In the first above-mentioned assay method, the focus of adjusting camera is calculated the absolute distance from the camera to the defective, obtains the short transverse position of the defective in the glass tape thus.Yet glass tape is vibration up and down sometimes in transport process.Therefore, in first assay method, have following problem: since glass tape about vibration, in the measurement result of the short transverse position of defective, be easy to generate error.
In second assay method, the 3rd assay method, not overlapping with two pictures in the image that photographs is the short transverse position that condition is calculated defective.Thereby, if shown in Figure 11 B two pictures 84,85 not overlapping in image like that, the short transverse position that then can calculate defective.Yet, existing under the big situation of situation, the defective of defective at the near interface of glass tape, two pictures of same defective are overlapping.When two pictures are overlapping, the short transverse position that in second assay method, the 3rd assay method, can't calculate defective.
In addition, in the 3rd assay method, near interface at glass tape exists under the situation of defective, such shown in Figure 12 B, the line camera of utilizing a side opposite with this interface to image in two pictures overlapping, utilization exist defective a side the line camera to image in two images not overlapping.In this case, according to the nonoverlapping image of picture in two images, the short transverse position that can calculate defective.
Yet, under the big situation of defective, in the 3rd assay method, also utilizing two line cameras 81 sometimes
a, 81
bTwo pictures are all overlapping in each image that (with reference to Figure 12 A) photographs.In this case, can't calculate the short transverse position of defective.
Therefore, even the object of the present invention is to provide a kind of near interface at glass tape to have in the glass tape of the short transverse position that also can measure the defective in the glass tape under the big situation of the situation of defective, defective defect testing system in the defect testing method and glass tape.
For the scheme of dealing with problems
The defect testing method is characterised in that in the glass tape of the present invention, may further comprise the steps: take step, to the glass tape that is transmitted (for example glass tape 5) irradiates light, the shooting unit (for example the line camera 3) of the position that arrives by the light that is configured in glass tape reflection comes glass tape is taken from light source (for example light source 2); And calculation step, according to by take unit photographs to image in, by overlapping each other of causing of the same defective of glass tape and have the position relation of two pictures of the intrinsic shape of the kind of this defective, calculate the short transverse position of defective in glass tape.
Can be following method also: in calculation step, calculate the camera site of a picture from two pictures that overlap each other (for example as 21,22) that caused by same defective to the displacement of the defective of the camera site of another picture (y for example
d), calculate the short transverse position of defective in glass tape according to the refraction angle of the light in the displacement that calculates and the glass tape.
Can be following method also: in calculation step, deduct the length (for example s) of the diameter of the defective parallel with direction of transfer by the corresponding length (for example h) in real space of pixel count on the parallel limit of the direction with the direction of transfer that is equivalent to glass tape from the boundary rectangle of two pictures that overlap each other (for example as 21,22) of being caused by same defective, calculate displacement.
Can be following method also: in calculation step, position relation according to two pictures that overlap each other that caused by same defective, use comprises the position of picture on the Width of glass tape and calculates the characteristic quantity (for example s, r) of defective as the calculating formula that is predetermined (for example formula (4), formula (5)) of variable (for example variable u), uses this characteristic quantity to calculate displacement.
Also can be following method: characteristic quantity be the length (for example s) of the diameter of the defective parallel with the direction of transfer of glass tape, deduct the length of the diameter of this defective by the corresponding length in real space of pixel count on the parallel limit of the direction with being equivalent to direction of transfer from the boundary rectangle of two pictures overlapping each other, calculate displacement.
Also can be following method: characteristic quantity be the ratio (for example r) of two diameters of defective, according to the line of the camera site of the frontal that is equivalent to take the unit in image line angulation and the above-mentioned ratio with each center by two pictures, calculate displacement.
In addition, the defect testing system is characterised in that to possess in the glass tape of the present invention: delivery unit (for example transfer roller 1), and its glass tape to the determination object of the short transverse position that becomes defective transmits; Light source (for example light source 2), it is to the glass tape irradiates light; Take unit (for example the line camera 3), it is disposed at the position that the light in the glass tape reflection arrives, and glass tape is taken; Arithmetic element (for example arithmetic unit 4), its according to by take unit photographs to image in, by overlapping each other of causing of the same defective of glass tape and have the position relation of two pictures of the intrinsic shape of the kind of defective, calculate the short transverse position of defective in glass tape.
Also can be following structure: arithmetic element be calculated the camera site of a picture from two pictures that overlap each other that caused by same defective to the displacement of the defective of the camera site of another picture (y for example
d), calculate the short transverse position of defective in glass tape according to the refraction angle of the light in the displacement that calculates and the glass tape.
Also can be following structure: arithmetic element deducts the length (for example s) of the diameter of the defective parallel with direction of transfer by the corresponding length (for example h) in real space of pixel count on the parallel limit of the direction with the direction of transfer that is equivalent to glass tape from the boundary rectangle of two pictures that overlap each other of being caused by same defective, and calculates displacement.
Also can be following structure: arithmetic element be according to the position relation of two pictures that overlap each other that caused by same defective, use comprises the position of picture on the Width of glass tape and calculates the characteristic quantity (for example s, r) of defective as the calculating formula that is predetermined (for example formula (4), formula (5)) of variable (for example variable u), uses this characteristic quantity to calculate displacement.
The effect of invention
According to the present invention, even exist under the big situation of situation, the defective of defective at the near interface of glass tape, also can measure the short transverse position of the defective in the glass tape.
Description of drawings
Fig. 1 is the synoptic diagram of the configuration example of defect testing system in the expression glass tape of the present invention.
Fig. 2 A is the key diagram of expression center line.
Fig. 2 B is the key diagram of the line that is equivalent to center line in the presentation video.
Fig. 3 is the key diagram of the relation between the direction of transfer of the direction of major diameter of the bubble of expression in the glass tape and transfer roller 1.
Fig. 4 is the process flow diagram of the example of the processing process of defect testing system in the glass tape of representing in first embodiment.
Fig. 5 is the key diagram in zone of the boundary rectangle of two pictures that overlap each other of expression.
Fig. 6 is the process flow diagram of the example of the processing process of defect testing system in the glass tape of representing in second embodiment.
Fig. 7 is the key diagram of the example of the glass tape of appearing before one's eyes in the presentation video.
Fig. 8 is the process flow diagram of the example of the processing process of defect testing system in the glass tape of representing in the 3rd embodiment.
Fig. 9 is the key diagram of the example of the glass tape of appearing before one's eyes in the presentation video.
Figure 10 A is the key diagram of schematically representing first assay method.
Figure 10 B is the key diagram of the example of the defect image that photographs by first assay method of expression.
Figure 11 A is the key diagram of schematically representing second assay method.
Figure 11 B is the key diagram of the example of the defect image that photographs by second assay method of expression.
Figure 12 A is the key diagram of schematically representing the 3rd assay method.
Figure 12 B is the key diagram of the example of the defect image that photographs by the 3rd assay method of expression.
Figure 13 is the key diagram of the position of expression when utilizing the line camera that the defective in the glass tape that is transmitted is taken.
Figure 14 is shooting distance y
cKey diagram.
Embodiment
Below, with reference to the description of drawings embodiments of the present invention.In the present invention, the kind of supposing to become the defective of the object that will be determined at the short transverse position in the glass tape is known.In addition, suppose this defective is taken and similarly be the picture with definite shape that comprises distinctive point (below be designated as unique point) in the image that obtains.In other words, the defective that becomes the measuring object of the short transverse position among the application is to satisfy the defective that is taken to the condition of the picture with definite shape that comprises unique point.As the example of such defective, can enumerate the bubble in the glass tape.Bubble is ellipsoid in glass tape.And bubble can use the white portion at center as unique point being the oval-shaped picture of white centered by appearing before one's eyes on the image.In the following embodiments, be that the situation of bubble is that example describes with defective.
[embodiment 1]
Fig. 1 is the synoptic diagram of the configuration example of defect testing system in the expression glass tape of the present invention.The defect testing system possesses transfer roller 1, light source 2, line camera 3 and arithmetic unit 4 in the glass tape of the present invention.
Light source 2 is configured in the one side side in two faces of glass tape 5, to glass tape 5 irradiates lights.This light 8 incides glass tape 5 from the interface, by in the glass tape and in 9 reflections of the interface of a side opposite with light incident side.The light of reflection arrives line camera 3 by the interface 8 of light incident side.In addition, in Fig. 1, represent the path of bright dipping simplifiedly, but shown in the side view on the top of Figure 13, the path of light produces complications respectively when 9 reflection backs are by interface 8 when light incides interface 8 and at the interface.
Line camera 3 is configured in from light source 2 irradiation and the position that arrives at the light of glass tape 5 reflections.Specifically, be benchmark with glass tape 5, be configured in a side identical with light source 2.In addition, for example, line camera 3 is benchmark with light source 2, is configured on the direction of transfer of glass tape 5.And the inside of 3 pairs of glass tapes 5 of line camera is taken, and generates image as shooting results.
By determining the allocation position of light source 2 and line camera 3, incident angle α in the path of light (with reference to the top of Figure 13) also is decided to be fixed value.And the refractive index n of supposing glass tape 5 also is known, and by finding the solution formula (1), the value of the refraction angle β the path of the light from light source 2 to line camera 3 also is decided to be fixed value.
Glass tape 5 is transmitted, and line camera 3 continues to take to glass tape 5 in the fixed position.Thereby along with effluxion, the position that is taken in the glass tape 5 changes.Thus, when the camera site scope orthogonal projection of the frontal of line camera 3 during to the interface 8 of glass tape 5, is expressed as straight line.This straight line is called center line.Fig. 2 A is the key diagram of expression center line, and Fig. 2 B is the key diagram of the line that is equivalent to center line in the presentation video.Fig. 2 A is the vertical view of glass tape 5.The camera site in the front of line camera 3 changes along with the transmission of glass tape 5, and its scope is illustrated as center line 95 to the orthogonal projection at interface.In addition, Fig. 2 B represents the image that photographs by line camera 3.In image, represent to be equivalent to the line 96 of center line 95 with dot-and-dash line.This line 96 can be called the scope of the pixel corresponding with the camera site of the frontal of line camera 3.In addition, center line 95 is parallel with the direction of transfer of glass tape 5, and the interior line 96 of image that is equivalent to center line 95 can be expressed the direction of the direction of transfer that is equivalent to glass tape 5 in the image.The interior line 96 of image that will be equivalent to center line 95 is designated as the direction of transfer line.In addition, in Fig. 2 B, illustrate direction of transfer line 96 in order to illustrate, but in the photographic images of reality, the direction of transfer line 96 of in image, not appearing before one's eyes out.
In glass tape 5, exist under the situation of defective (in this example for bubble), in the image that online camera 3 is taken, the picture of two these defectives that caused by a defective occurs.In addition, in the present example, defective is bubble, so the picture that occurs in the image be oval, and its central part is white.
Arithmetic unit 4 is measured the short transverse position of defective with reference to the image that photographs by line camera 3.In the side view on the top of Figure 13, the short transverse position of this defective is the length that is expressed as " d ".That is in glass tape 5, be from playing the distance of defective with the interface 9 of light source 2 opposition sides.Under the situation that the paired picture of taking common defective gained overlaps each other, arithmetic unit 4 is according to the position relation of the picture (being oval-shaped picture) of the intrinsic shape of the kind (being bubble in the present example) of defective, the short transverse position of calculating the defective in the glass tape 5.Specifically, arithmetic unit 4 calculates following value, and this value is the value that the corresponding distance in real space of pixel count on the parallel limit of the direction with the direction of transfer that is equivalent to glass tape the boundary rectangle of two pictures that overlap each other in image deducts the length gained of the diameter parallel with direction of transfer in the diameter of defective (bubble).In addition, in image, parallel with the direction of the direction of transfer that is equivalent to glass tape refer to parallel with direction of transfer line 96 (with reference to Fig. 2 B).The short transverse position that arithmetic unit 4 calculates defective according to the value of obtaining by above-mentioned subtraction and the refraction angle β in the glass tape 5.To with reference to Fig. 5 this calculating be described in the back.
In addition, the major diameter of the bubble in the glass tape and direction of transfer (in other words being the bearing of trend of the glass tape 5) almost parallel of transfer roller 1.As shown in Figure 3, the departing from of direction of transfer 71 of the direction of the major diameter 72 of bubble and transfer roller 1 transmission glass tape 5 is 10 ° to the maximum.Like this, direction of transfer 71 almost parallels of the major diameter of bubble 72 and transfer roller 1 therefore in the image that online camera 3 photographs, are expressed as also almost parallel of the major diameter of picture of oval-shaped defective and direction of transfer line 96 (with reference to Fig. 2 B).Below, be that example describes with the major diameter of the picture of defective in the image that photographs and direction of transfer line 96 parallel situations.
In addition, under the situation that paired picture does not overlap each other, the short transverse position that arithmetic unit 4 calculates defective by known method gets final product.
In addition, the allocation position of line camera 3 is fixed.Thereby a pixel in the image that photographs with line camera 3 distance in real space accordingly also is decided to be fixed value.Suppose with image in a pixel accordingly the distance in real space be known.
Then, action is described.Fig. 4 is the process flow diagram of the example of the processing process of defect testing system in the glass tape of representing in the present embodiment.
At first, light source 2 beginnings are to glass tape 5 irradiates lights (step S1).
Then, transfer roller 1 transmits the glass tape 5 that is configured on the transfer roller 1 to fixed-direction, and line camera 3 continues the inside of the glass tape 5 that is transmitted is taken.Then, line camera 3 generates image (step S2) as shooting results.Line camera 3 will be sent to arithmetic unit 4 by the image that shooting obtains.
Exist in the inside of glass tape 5 under the situation of defective, comprise the picture of defective in the image that in step S2, obtains.In the present example, defective is bubble, the oval-shaped picture of therefore appearing before one's eyes out in image.In addition, as shown in Figure 13, respectively defective move to reflect before the position (position 91 shown in the side view on the top of Figure 13) of path overlap of light the time and defective move to reflect after the position (position 92 shown in the side view on the top of Figure 13) of path overlap of light the time, appearing before one's eyes in image is picture.Thereby, under the situation that has a defective, two pictures of in image, appearing before one's eyes.In addition, be present in the big situation of defective, defective glass tape 5 interface 9 (with reference to Fig. 1) near situation under, these two pictures overlap each other.
Arithmetic unit 4 detects the zone of the boundary rectangle of two pictures that overlap each other from image when receiving the image that generates in step S2.Then, in the limit of this boundary rectangle, in image the limit parallel with the direction of the direction of transfer that is equivalent to glass tape (that is, with image in the limit of direction of transfer line parallel) pixel count count.Then, arithmetic unit 4 multiply by the distance in real space of each pixel with the pixel count on this limit, calculates thus and the pixel count on this limit length in real space (step S3) accordingly.
Fig. 5 is the key diagram in zone of the boundary rectangle of two pictures that overlap each other of expression.As shown in Figure 5, as two pictures 21 that overlap each other, 22 boundary rectangle, determine boundary rectangle 23 shown in Figure 5.As the 21, the 22nd, oval, it is congruent can being considered as.In example shown in Figure 5, suppose that the long limit of boundary rectangle 23 is parallel with direction of transfer line (with reference to Fig. 2 B).In this case, 4 pairs of arithmetic units are counted as the pixel count on the long limit 24 of 21,22 boundary rectangle 23, this pixel count be multiply by the distance in real space of each pixel.With the long limit of " h " expression and this 24 corresponding length in real space.The unit of h for example is μ m.
In addition, be under the situation of bubble in defective, the central part 21 as 21
aImage be white.This central part 21
aIt is the unique point of picture 21.4 pairs of central parts 21 from a picture 21 of arithmetic unit
aThe pixel count of the minor face of the close side in the minor face of boundary rectangle 23 is counted.That is, the pixel count of the part represented with Reference numeral A in Fig. 5 is counted.Arithmetic unit 4 multiply by this pixel count the distance in real space of each pixel.Its multiplication result is and the part that is equivalent to A shown in Figure 5 length in real space accordingly, specifically, is 1/2nd length of the diameter (diameter parallel with direction of transfer in the diameter of defective) of the defective parallel with direction of transfer.In example shown in Figure 5, this diameter is the major diameter of defective.Arithmetic unit 4 calculates the length of the diameter of the defective parallel with direction of transfer (step S4) by above-mentioned multiplication result being multiply by twice.The length of the diameter of this defective is made as s.The unit of s for example is μ m.Position in the image corresponding with the length of s/2 in the real space is the part of representing with Reference numeral A in Fig. 5.In addition, it is congruent two can being considered as 21,22, therefore in Fig. 5, can be considered as A=A '.
In addition, at this, to use the central part 21 as 21
aThe situation of calculating s is that example is illustrated, but also can use the central part as 22 to calculate s.
In addition, in Fig. 5, be that example is illustrated with the major diameter of the picture of defective and the situation of direction of transfer line parallel, but also have the major diameter situation not exclusively parallel with the direction of transfer line of the picture of defective.Yet the maximum that departs between the major diameter of the bubble in the glass tape and the direction of transfer of glass tape has only 10 ° (with reference to Fig. 3).Thus, even the major diameter of the picture of defective is not exclusively parallel with the direction of transfer line, it is parallel also can be considered as both, similarly calculates h, s with above-mentioned step S3, S4.That is, when obtaining h, the pixel count on the long limit of the boundary rectangle of two pictures overlapping each other is counted, the distance in real space that this pixel count be multiply by each pixel gets final product.In addition, when obtaining s, the pixel count of the minor face of the close side from the central part of a picture to the minor face of boundary rectangle is counted, this pixel count be multiply by the distance in real space of each pixel and its multiplication result be multiply by twice get final product.Even the major diameter of the picture of defective and the not exclusively parallel short transverse position of also calculating h, s as described above and using this h, s to calculate defective of direction of transfer line are even also only comprise the error of the degree that can ignore like this.
Then, arithmetic unit 4 deducts the s (step S5) that calculates in step S4 from the h that calculates among step S3.This operation result is made as y
dy
dBe to the displacement of the defective of the position of having taken second picture from the position of having taken first picture.That is the y that in step S5, calculates,
dIt is the distance of taking between 2 of picture of defective.In addition, with real space in y
dThe image of length correspondence in the position be the part of representing with Reference numeral B among Fig. 5.
Arithmetic unit 4 uses the y that calculates in step S5
d, the refraction angle β that is predetermined, the short transverse position d of defective is calculated in the calculating of carrying out formula (2).That is, calculate y
d/ (2 * tan β) is made as d (step S6) with its operation result.The short transverse position d of defective is to the distance of defective from the interface 9 (with reference to Fig. 1) of glass tape 5.
According to present embodiment, even two pictures that caused by same defective overlap each other, also can measure the short transverse position of this defective.Thereby, even exist under the big situation of situation, the defective of defective at the near interface of glass tape, also can measure the short transverse position of the defective in the glass tape.
In addition, the s that calculates in step S4 is the length of the major diameter of defective.In addition, under the major diameter of the picture of defective and the not exclusively parallel situation of direction of transfer line, also the s that calculates among the step S4 being considered as is the length of major diameter of defective, even also only comprise the error of the degree that can ignore like this.Thereby, also can calculate the size (size of major diameter) of defective.
In addition, according to present embodiment, light source 2 and line camera 3 are disposed at the one-sided of glass tape 5 get final product.Thereby (with reference to Figure 12 A) compares with the 3rd assay method, can reduce the number that arranges of light source 2 and line camera 3, can reduce and measure required cost.
[embodiment 2]
Second embodiment of the present invention and first embodiment are same, possess transfer roller 1, light source 2, line camera 3 and arithmetic unit 4 (with reference to Fig. 1).Light source 2 is identical with first embodiment with respect to the position relation of glass tape 5 with line camera 3, omits explanation.In second embodiment, the assay method of the short transverse position of arithmetic unit 4 mensuration defectives is different with first embodiment.
In second embodiment, arithmetic unit 4 calculates the characteristic quantity of the defective in the glass tape 5.Then, arithmetic unit 4 uses these characteristic quantities to calculate following value, and this value is the value of the length gained of the corresponding length in real space of pixel count on the parallel limit of the direction with the direction of transfer that is equivalent to glass tape from the boundary rectangle of two pictures that the overlap each other diameter (diameter parallel with direction of transfer in the diameter of defective) that deducts the defective parallel with the direction of transfer of glass tape.In addition, arithmetic unit 4 according to the position relation of two pictures that overlap each other, uses the calculating formula that is predetermined to come the calculated characteristics amount when calculating above-mentioned characteristic quantity.
In addition, in second embodiment, as characteristic quantity, calculate the length of the diameter of the defective parallel with the direction of transfer of glass tape.
Formula that be used for to calculate above-mentioned characteristic quantity is predetermined is the area of the h of the coordinate that will be the position corresponding with unique point picture benchmark with the end of glass tape, explanation in the first embodiment and two pictures that the overlap each other function as variable.For example can be used for determining the calculating formula of this characteristic quantity (diameter parallel with direction of transfer of the diameter of defective) with following formula (4) expression.
S=a
1u
2+ a
2h
2+ a
3p
2+ a
4Uh+a
5Hp+a
6Up+a
7U+a
8H+a
9P+a
10Formula (4)
In formula (4), " u " is that the end with glass tape is the coordinate of the position corresponding with unique point picture benchmark, specifically, is to the distance at the center of defective from the side of the glass tape parallel with direction of transfer.At this, the unit of u is mm." h " is according to defective being taken the image of gained, the value that obtains by the calculating identical with step S3 in first embodiment.At this, the unit of h is μ m.P is the area in the zone (union in the zone of two pictures) that two pictures occupy in the image of defective being taken gained, specifically, represents with the pixel count in the image.A in the formula (4)
1～a
10It is coefficient.In addition, the s in the formula (4) is the diameter of the defective parallel with the direction of transfer of glass tape.The diameter s that becomes characteristic quantity is different and be affected easily in the position of the Width of glass tape according to defective, therefore uses the calculating formula that comprises above-mentioned variable u (for example above-mentioned formula (4)) in the calculating of s.
In addition, in the image that photographs, under the situation of the major diameter of the picture of defective and direction of transfer line parallel, above-mentioned s is equivalent to the major diameter of defective.Wherein, even in image under the not exclusively parallel situation of the major diameter of the picture of defective and direction of transfer line, both are almost parallel also, and therefore above-mentioned characteristic quantity s can be considered as is the major diameter of defective.Even being considered as like this is the major diameter of defective, also only comprise the error of the degree that can ignore, to the not influence of calculating of the short transverse position of defective.
Obtain coefficient a in the formula (4) by least square method in advance
1～a
10Specifically, use the defective that becomes sample that s, u are surveyed.In addition, at the glass tape that comprises the defective that becomes sample, carry out the processing identical with step S1～S3 of illustrating in first embodiment and obtain h.In addition, at this moment according to the image that in step S2, obtains, the pixel count p in the zone of the union that becomes two pictures is counted.Prepare a plurality of defectives that become sample, obtain s, u, h and p like this at these each defectives.If obtain the groups of many group s, u, h and p, then can be according to the group of these s, u, h and p, obtain coefficient a in the formula (4) by least square method
1～a
10
Have correlativity between s and u, h and the p, can obtain each coefficient in the formula (4) by least square method.
Arithmetic unit 4 is obtained u, h and p, and is updated in the formula (4) according to taking the image that obtains by the glass tape to the determination object of the short transverse position that becomes defective, calculates s thus.Then, arithmetic unit 4 calculates h-s (=y
d), use its result of calculation and refraction angle β to calculate the short transverse position of defective.
The action of second embodiment then, is described.Fig. 6 is the process flow diagram of the example of the processing process of defect testing system in the glass tape of representing in second embodiment.To the additional Reference numeral identical with Fig. 4 of the processing identical with processing shown in Figure 4, omit explanation.
Action till calculating h in step S3 is identical with first embodiment.
Fig. 7 is the key diagram of the example of the glass tape of appearing before one's eyes out in the presentation video.There is under the situation of defective the picture 21,22 of the defective of in image, also appearing before one's eyes out.In addition, in example shown in Figure 7, as the unique point of picture, each is as 21,22 core 21
a, 22
aIn image, also show as the zone of white.In addition, illustrate the boundary rectangle 23 of picture 21,22, but boundary rectangle 23 is not appeared before one's eyes in image.
Behind step S3, count to the pixel count of the unique point of picture the end 31 from glass tape in 4 pairs of images of arithmetic unit.That is, the pixel count of the part represented with reference number C in Fig. 7 is counted.Then, arithmetic unit 4 multiply by this pixel count the distance in real space (step S11) of each pixel.Its multiplication result be equivalent in the real space the end from glass tape (side) to defective apart from u.That is, in step S11, calculate u.
Wherein, in the explanation of above-mentioned step S11, for the purpose of simplifying the description, be that example is illustrated with the situation of the end 31 of the glass tape of in image, appearing before one's eyes out.Under the situation of end 31 of glass tape of in image, not appearing before one's eyes out, calculate apart from u as follows and get final product.The position that arranges of line camera 3 is fixed, and the distance real space of an end of the glass tape end side in therefore can obtaining from the end of glass tape to the image that photographs by line camera 3 in advance (is made as u
0).Then, arithmetic unit 4 calculates the distance from the part of this end to the unique point of picture in the image that photographs.In this calculates, for example the part from this end in the image to be counted to the pixel count of unique point, the distance in real space that this pixel count be multiply by each pixel gets final product.Arithmetic unit 4 is by will this distance and the u that the position determines that arranges according to the line camera
0The end from glass tape (side) the getting final product apart from u to defective in the real space calculated by the phase Calais.
In addition, in example shown in Figure 7, to use the core 21 as 21
aAs unique point and obtain in the image from the end 31 of glass tape to core 21
aThe situation of distance be example.Also can use another as 22 core 22
aAs unique point.Use core arbitrarily as unique point all can obtain in the real space the end from glass tape (side) to defective apart from u.According to using core 21
a, 22
aWhich as unique point and the count results difference of pixel count, but its difference is minimum, only comprises the error that can ignore in distance u.In addition, also can use the distinctive point (for example any one summit of boundary rectangle 23) in the boundary rectangle 23 to be used as unique point.In this case, in distance u, also only comprise the error that to ignore.
Behind step S11, as two that the overlap each other areas as 21,22 zones that occupy (union in the zone of two pictures), 4 pairs of the arithmetic units pixel count p in should the zone counts (step S12).
Then, h, the u that arithmetic unit 4 will be obtained in step S3, S11 and S12 and p are updated in the formula (4), calculate the diameter s (step S13) parallel with direction of transfer in the diameter of defective thus.Under the situation as major diameter and direction of transfer line parallel as shown in Figure 7, this diameter s is the major diameter of defective.Such as already explained, even the major diameter of picture is not exclusively parallel with the direction of transfer line in photographic images, both are almost parallel also, and therefore the diameter s that calculates in step S13 can be considered as is the major diameter of defective.
Later processing is identical with step S5, S6 in first embodiment.That is, arithmetic unit 4 deducts the s that calculates in step S13 from the h that calculates among step S3, obtain y thus
d(step S5).Then, arithmetic unit 4 uses y
dWith refraction angle β, the short transverse position d of defective is calculated in the calculating of carrying out formula (2).
In second embodiment, also can access the effect identical with first embodiment.In addition, in second embodiment, also in step S13, calculate the value of s, therefore also can obtain the size (major diameter) of defective.
[embodiment 3]
The 3rd embodiment of the present invention is identical with first embodiment, possesses transfer roller 1, light source 2, line camera 3 and arithmetic unit 4 (with reference to Fig. 1).Light source 2 is identical with first embodiment with respect to the position relation of glass tape 5 with line camera 3, omits explanation.
In the 3rd embodiment, arithmetic unit 4 also calculates the characteristic quantity of the defective in the glass tape 5, uses this characteristic quantity to calculate y
dBut, in second embodiment, calculate the diameter s of defective as characteristic quantity, but in the 3rd embodiment, calculate the ratio of two diameters of defective.Specifically, arithmetic unit 4 diameter of obtaining the direction of transfer in the diameter of defective with respect to the ratio of the diameter of the direction of the direction of transfer quadrature characteristic quantity as defective.That is, the diameter with the direction direction of transfer quadrature in the diameter of establishing defective is r
1, direction of transfer diameter be r
2The time, calculate r
2/ r
1As characteristic quantity.Below, with r
2/ r
1Be designated as r.
In addition, in the image that photographs, under the situation of the major diameter of the picture of defective and direction of transfer line parallel, above-mentioned r
1The minor axis that is equivalent to defective, r
2The major diameter that is equivalent to defective.That is, calculate " major diameter/minor axis " as characteristic quantity r.Wherein, under the not exclusively parallel situation of the major diameter of the picture of defective and direction of transfer line, both are almost parallel also, therefore can be with above-mentioned r in image
1Being considered as is the minor axis of defective, with above-mentioned r
2Being considered as is the major diameter of defective.That is, even in image under the not exclusively parallel situation of the major diameter of the picture of defective and direction of transfer line, also the r that calculates as characteristic quantity can be considered as is " major diameter/minor axis " of defective.Even like this, also only comprise the error of the degree that can ignore among the r, to the not influence of calculating of the short transverse position of defective.
Arithmetic unit 4 uses this r after calculating the characteristic quantity of r as defective, obtain y
d(from the position of having taken first picture to the displacement of the defective of the position of having taken second picture).
In addition, arithmetic unit 4 according to the position relation of two pictures that overlap each other, uses the calculating formula that is predetermined to come the calculated characteristics amount when calculating above-mentioned characteristic quantity r.
To be predetermined for the formula of calculating this characteristic quantity r and be the area of the h of the coordinate that will be the position corresponding with unique point picture benchmark with the end of glass tape, explanation in the first embodiment and two pictures that the overlap each other function as variable.For example can be used for obtaining the calculating formula of characteristic quantity r with following formula (5) expression.
R=b
1u
2+ b
2h
2+ b
3p
2+ b
4Uh+b
5Hp+b
6Up+b
7U+b
8H+b
9P+b
10Formula (5)
Variable u, h in this function and p are identical with variable u, h and p in the formula shown in second embodiment (4).That is, " u " is to the distance at the center of defective from the side of the glass tape parallel with direction of transfer." h " is according to defective being taken the image of gained, the value that obtains by the calculating identical with step S3 in first embodiment.P is the area in the zone (union in the zone of two pictures) that two pictures occupy in the image of defective being taken gained, specifically, represents with the pixel count in the image.B in the formula (5)
1～b
10It is coefficient.For characteristic quantity r, because defective is different and be affected easily in the position of the Width of glass tape, therefore in the calculating of r, use the calculating formula that comprises above-mentioned variable u (for example above-mentioned formula (5)).
Obtain coefficient b in the formula (5) by least square method in advance
1～b
10Specifically, use the defective that becomes sample to come r, u are surveyed.In addition, at the glass tape that comprises the defective that becomes sample, carry out the processing identical with step S1～S3 of illustrating in first embodiment and obtain h.In addition, at this moment according to the image that in step S2, obtains, to the pixel count p counting in the zone of the union that becomes two pictures.Prepare a plurality of defectives that become sample, obtain r, u, h and p like this at these each defectives.If obtain the groups of many group r, u, h and p, then can be according to the group of these r, u, h and p, obtain coefficient b in the formula (5) by least square method
1～b
10
Have correlativity between r and u, h and the p, can obtain each coefficient in the formula (5) by least square method.
Arithmetic unit 4 is according to taking the image that obtains by the glass tape to the determination object of the short transverse position that becomes defective, obtains u, h and p and is updated in the formula (5), calculates r thus.
In addition, when the angle that direction of transfer line 96 becomes with the line at center by two pictures in the image that will photograph was made as θ, arithmetic unit 4 was obtained the value of tan θ.Then, arithmetic unit 4 uses h, u, r and tan θ to calculate y
dArithmetic unit 4 uses this y
dThe short transverse position of calculating defective with refraction angle β.
The action of the 3rd embodiment then, is described.Fig. 8 is the process flow diagram of the example of the processing process of defect testing system in the glass tape of representing in the 3rd embodiment.The Reference numeral additional identical with Fig. 4, Fig. 6 to the processing identical with first embodiment, second embodiment, the omission explanation.
Action (step S1, S2, S3, S11 and S12) to obtain p in step S12 till is identical with second embodiment.
Behind step S12, h, the u that arithmetic unit 4 will be obtained in step S3, S11 and S12 and p are updated in the formula (5), calculate r (that is, the length of the diameter of the direction of transfer in the diameter of defective with respect to the ratio of the length of the diameter of the direction of direction of transfer quadrature) (step S21) thus.
Fig. 9 is the key diagram of the example of the glass tape of appearing before one's eyes in the presentation video.To the additional Reference numeral identical with Fig. 7 of the key element identical with Fig. 7, omit explanation.
Behind step S21, the pixel count on the limit as in the limit of 21,22 boundary rectangle 23 and the direction quadrature direction of transfer that is equivalent to glass tape that 4 pairs two of arithmetic units overlap each other (in other words, in the image with limit direction of transfer line quadrature) is counted.That is, the pixel count of the part represented with Reference numeral D in Fig. 9 is counted.Then, arithmetic unit 4 multiply by this pixel count the distance in real space (step S22) of each pixel.To be designated as w as the length that its result obtains.That is, w is the length in real space corresponding with the part represented with Reference numeral D among Fig. 9.
In addition, the tangent that arithmetic unit 4 is obtained angle θ is tan θ (step S23), this angle θ be the parallel limit of the direction with the direction of transfer that is equivalent to glass tape in the limit of boundary rectangle with by two pictures 21,22 core 21
a, 22
aThe angle that becomes of line.
Also θ can be called by two pictures 21,22 core 21
a, 22
aThe angle that becomes with the direction of transfer line of line.Thereby arithmetic unit 4 for example also can be predetermined y
cThe value of (with reference to Figure 14) is calculated x by the method that has illustrated
Cc, calculate tan θ by the calculating of carrying out formula (3).Perhaps, also can calculate tan θ by other method.
Then, arithmetic unit 4 uses h, the r, w and the tan θ that have calculated in the processing till step S23 to calculate y
d(step S24).Specifically, arithmetic unit 4 calculates y by the calculating of carrying out formula shown below (6)
dGet final product.
y
d=(the formula (6) of h-r * w)/(1-r * tan θ)
Arithmetic unit 4 uses above-mentioned y
dWith the refraction angle β that is predetermined, the short transverse position d (step S25) of defective is calculated in the calculating of carrying out formula (2).This calculates identical with step S6 in first embodiment.
In addition, also can in step S25, obtain the short transverse position of defective and end process.In addition, with other embodiment similarly, under the situation of the length of the diameter that calculates the defective parallel with direction of transfer, arithmetic unit 4 deducts y from h
dCalculate s and get final product (step S26).
In the 3rd embodiment, also can access and first embodiment, effect that second embodiment is identical.In addition, in the 3rd embodiment, can also obtain the ratio r of diameter of defective as the characteristic quantity of defective.
In each above-mentioned embodiment, realize arithmetic unit 4 by the computing machine that moves according to program.For example, also can be that computing machine moves as arithmetic unit 4 according to program.
In addition, in each above-mentioned embodiment, be that the situation of bubble is example with defective, but being made as the defective of determination object, the present invention is not limited to bubble, get final product so long as satisfy the defective that is taken to the condition of the picture with definite shape that comprises unique point.As such defective, except bubble, can also enumerate foreign matter etc.
Utilizability on the industry
The present invention is fit to be applied to measure the short transverse position etc. of the defective of glass tape inside.
Understand the application in detail with reference to specific embodiment, but clearly for a person skilled in the art can apply various changes, modification as can be known with not breaking away from the spirit and scope of the present invention.
The application quotes its content at this as reference based on the Japanese patent application (special hope 2010-275048) of application on Dec 9th, 2010.
Description of reference numerals
1: transfer roller; 2: light source; 3: the line camera; 4: arithmetic unit; 5: glass tape.
Claims (10)
1. the interior defect testing method of glass tape is characterized in that, may further comprise the steps:
Take step, to the glass tape irradiates light that is transmitted, the shooting unit of the position that arrives by the light that is configured in above-mentioned glass tape reflection comes above-mentioned glass tape is taken from light source; And
Calculation step, according to by above-mentioned shooting unit photographs to image in, by overlapping each other of causing of the same defective of above-mentioned glass tape and have the position relation of two pictures of the intrinsic shape of the kind of above-mentioned defective, calculate the short transverse position of above-mentioned defective in above-mentioned glass tape.
2. defect testing method in the glass tape according to claim 1 is characterized in that,
In above-mentioned calculation step, calculate the camera site of a picture from above-mentioned two pictures that overlap each other to the displacement of the defective of the camera site of another picture,
Calculate the short transverse position of above-mentioned defective in above-mentioned glass tape according to the refraction angle of the light in the above-mentioned displacement that calculates and the above-mentioned glass tape.
3. defect testing method in the glass tape according to claim 2 is characterized in that,
In above-mentioned calculation step, deduct the length of the diameter of the defective parallel with above-mentioned direction of transfer by the corresponding length in real space of pixel count on the parallel limit of the direction with the direction of transfer that is equivalent to above-mentioned glass tape from the boundary rectangle of above-mentioned two pictures that overlap each other, calculate above-mentioned displacement.
4. defect testing method in the glass tape according to claim 2 is characterized in that,
In above-mentioned calculation step, position relation according to above-mentioned two pictures that overlap each other, use comprises the position of picture on the Width of above-mentioned glass tape and calculates the characteristic quantity of above-mentioned defective as the calculating formula that is predetermined of variable, uses this characteristic quantity to calculate above-mentioned displacement.
5. defect testing method in the glass tape according to claim 4 is characterized in that,
Above-mentioned characteristic quantity is the length of the diameter of the defective parallel with the direction of transfer of above-mentioned glass tape, deduct the length of above-mentioned diameter by the corresponding length in real space of pixel count on the parallel limit of the direction with being equivalent to above-mentioned direction of transfer from the boundary rectangle of above-mentioned two pictures that overlap each other, calculate above-mentioned displacement.
6. defect testing method in the glass tape according to claim 4 is characterized in that,
Above-mentioned characteristic quantity is the ratio of two diameters of above-mentioned defective, according to the line of the camera site of the frontal that is equivalent to above-mentioned shooting unit in image line angulation and the above-mentioned ratio with each center by above-mentioned two pictures, calculates above-mentioned displacement.
7. defect testing system in the glass tape is characterized in that possessing:
Delivery unit, its glass tape to the determination object of the short transverse position that becomes defective transmits;
Light source, it is to above-mentioned glass tape irradiates light;
Take the unit, it is disposed at the position that the light in above-mentioned glass tape reflection arrives, and above-mentioned glass tape is taken; And
Arithmetic element, its according to by above-mentioned shooting unit photographs to image in, by overlapping each other of causing of the same defective of above-mentioned glass tape and have the position relation of two pictures of the intrinsic shape of the kind of above-mentioned defective, calculate the short transverse position of above-mentioned defective in above-mentioned glass tape.
8. defect testing system in the glass tape according to claim 7 is characterized in that,
Arithmetic element is calculated the camera site of a picture from above-mentioned two pictures that overlap each other to the displacement of the defective of the camera site of another picture,
Calculate the short transverse position of above-mentioned defective in above-mentioned glass tape according to the refraction angle of the light in the above-mentioned displacement that calculates and the above-mentioned glass tape.
9. defect testing system in the glass tape according to claim 7 is characterized in that,
Arithmetic element deducts the length of the diameter of the defective parallel with above-mentioned direction of transfer by the corresponding length in real space of pixel count on the parallel limit of the direction with the direction of transfer that is equivalent to above-mentioned glass tape from the boundary rectangle of above-mentioned two pictures that overlap each other, and calculates above-mentioned displacement.
10. defect testing system in the glass tape according to claim 7 is characterized in that,
Arithmetic element is according to the position relation of above-mentioned two pictures that overlap each other, use comprises the position of picture on the Width of above-mentioned glass tape and calculates the characteristic quantity of above-mentioned defective as the calculating formula that is predetermined of variable, uses this characteristic quantity to calculate above-mentioned displacement.
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| JP2010275048 | 2010-12-09 | ||
| JP2010-275048 | 2010-12-09 | ||
| PCT/JP2011/078203 WO2012077683A1 (en) | 2010-12-09 | 2011-12-06 | Method and system for measuring defect in glass ribbon |
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|---|---|
| CN103250047A true CN103250047A (en) | 2013-08-14 |
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| CN2011800594339A Pending CN103250047A (en) | 2010-12-09 | 2011-12-06 | Method and system for measuring defect in glass ribbon |
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| JP (1) | JPWO2012077683A1 (en) |
| KR (1) | KR20130140058A (en) |
| CN (1) | CN103250047A (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN104655646A (en) * | 2014-04-24 | 2015-05-27 | 东旭集团有限公司 | Glass substrate internal defect checking system and checking method for height position of internal defect |
| WO2019041087A1 (en) * | 2017-08-28 | 2019-03-07 | 深圳市兴华炜科技有限公司 | Transparent object testing method and related product |
| CN109060819A (en) * | 2018-07-06 | 2018-12-21 | 中国飞机强度研究所 | Error correcting method in visual field in a kind of measurement of vibration component crackle |
| CN109060819B (en) * | 2018-07-06 | 2021-03-30 | 中国飞机强度研究所 | Method for correcting errors in field of view in measurement of cracks of vibration component |
| CN113614047A (en) * | 2019-02-06 | 2021-11-05 | 康宁公司 | Method of treating adhesive tape |
| CN113614047B (en) * | 2019-02-06 | 2023-09-19 | 康宁公司 | Method for treating adhesive tape |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2012077683A1 (en) | 2012-06-14 |
| TW201233993A (en) | 2012-08-16 |
| KR20130140058A (en) | 2013-12-23 |
| JPWO2012077683A1 (en) | 2014-05-19 |
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