Source: http://www.google.com/patents/US20020154308?dq=5311516
Timestamp: 2015-03-03 05:12:30
Document Index: 558783125

Matched Legal Cases: ['arts 132', 'arts 134', 'art 138', 'art 138', 'art 138', 'art 138', 'arts 132']

Patent US20020154308 - Method for marking defect and device therefor - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsThe defect marking method comprises the steps of: installing a surface defect tester to detect surface flaw and a marker device to apply marking at defect position, in a continuous processing line of steel sheet; detecting the surface flaw on the steel sheet using the surface defect tester; determining...http://www.google.com/patents/US20020154308?utm_source=gb-gplus-sharePatent US20020154308 - Method for marking defect and device thereforAdvanced Patent SearchPublication numberUS20020154308 A1Publication typeApplicationApplication numberUS 09/956,737Publication dateOct 24, 2002Filing dateSep 17, 2001Priority dateMar 18, 1999Also published asCA2365879A1, CA2365879C, CA2676748A1, CA2676748C, DE60036939D1, DE60036939T2, EP1178301A1, EP1178301A4, EP1178301B1, EP1857811A2, EP1857811A3, US7248366, US7423744, US7599052, US20070052964, US20090086209, WO2000055605A1Publication number09956737, 956737, US 2002/0154308 A1, US 2002/154308 A1, US 20020154308 A1, US 20020154308A1, US 2002154308 A1, US 2002154308A1, US-A1-20020154308, US-A1-2002154308, US2002/0154308A1, US2002/154308A1, US20020154308 A1, US20020154308A1, US2002154308 A1, US2002154308A1InventorsMitsuaki Uesugi, Shoji Yoshikawa, Masaichi Inomata, Tsutomu Kawamura, Takahiko Oshige, Hiroyuki Sugiura, Akira Kazama, Tsuneo Suyama, Yasuo Kushida, Shuichi Harada, Hajime Tanaka, Osamu Uehara, Shuji Kaneto, Masahiro Iwabuchi, Kozo Harada, Shinichi Tomonaga, Shigemi FukudaOriginal AssigneeNkk Corporation, A Japanese CorporationExport CitationBiBTeX, EndNote, RefManReferenced by (6), Classifications (7), Legal Events (3) External Links: USPTO, USPTO Assignment, EspacenetMethod for marking defect and device therefor
US 20020154308 A1Abstract
The defect marking method comprises the steps of: installing a surface defect tester to detect surface flaw and a marker device to apply marking at defect position, in a continuous processing line of steel sheet; detecting the surface flaw on the steel sheet using the surface defect tester; determining defect name, defect grade, defect length, and defect position in the width direction of the steel sheet, on the basis of thus detected flaw information, further identifying the defect in terms of harmful defect, injudgicable defect, and harmless defect; applying tracking of the defect position for each of the harmful defect and the injudgicable defect; and applying marking to the defect position. The defect marking device comprises a defect inspection means having plurality of light-receiving parts and a signal processing section, and a marking means. Images(36) Claims(44)
[0229] The matrix expression of R(ξ) becomes the formula 2. R  ( ξ ) = [ cos   ξ  - sin   ξ sin   ξ cos   ξ  ] Formula   2 [0230] Eq. (2) is a particular case of eq. (3) substitutingξ=0. Thus, both the specular reflection component and the specular-diffuse reflection component can be integrally treated by eq. (3). [0231] When eq. (3) is calculated to draw a figure of elliptical polarized light state for the light reflected from micro-area elements having a normal angle ξ, FIG. 47 is obtained. The azimuth α of the incident polarized light was assumed to 45 degrees, the incident angle θ was assumed to 60 degrees, and the reflection characteristics of steel sheet were assumed as ψ=28� and Δ=120�. The figure suggests that the ellipse inclines with variations in ξ value against the ellipse at ξ=0, or against the case of specular reflection. Consequently, for example, by inserting an analyzer before the light detector to set the analyzing angle, selection becomes possible to determine the main reflected light coming from particular micro-area elements with a particular normal angle. [0232] To quantify the above-described procedure, the state of polarized light ED , which is obtained by inserting an analyzer having an analyzing angle β into a reflected light in a polarized state, is expressed by eq.(3). E D=R(β)�A�R(−β)�E A =R(β)�A�R(−β)�R(ξ)�T�R(−ξ)�E in (4) [0233] where, A=(Amn) designates the matrix expressing the analyzer, and A11=1, while other components are 0. The matrix expression of A becomes the formula 3. A = [  1 0 0 0  ] Formula   3 [0234] When the light intensity L of the reflected light on the micro-area elements having a normal angle ξ, detected by the light detector 116 (FIG. 46) is calculated by eq. (4), the light intensity L is expressed by eq. (5) with an assumption of the area percentage of the micro-area element of S(ξ). L=S(ξ)�|E D| 2 =r s 2 �Ep 2 �S(ξ)�I(ξ,β) I(ξ,β)=tan2ψ�cos2 (ξ−α)�cos2 (ξ−β)+2�tan ψ�cos Δ�cos (ξ−α)�sin (ξ−α)�cos (ξ−β)�sin (ξ−β)+sin2 (ξ−α)�sin2 (β−ξ) (5) [0235] where, I (ξ,β) is, as described before, the weight function that determines the degree of identification of reflected light on the micro-area elements having a normal angle ξ, which weight function depends on the polarization characteristics of optical system and of inspection body. The product of the weight function and the reflectance of steel sheet, rs 2, the incident light quantity Ep2, and the area rate S(ξ) is the light intensity that can be detected. In the case of a surface-treated steel sheet, or a homogeneous material on the surface of steel sheet, the value of rs 2 should be constant. In addition, the value of Ep2 may also be constant if the incident light quantity is uniform at all positions of light source. Accordingly, to determine the light intensity that is detected by the light detector, only variables to be considered are the area percentage S(ξ) of micro-area elements having a normal angle ξ and the identification characteristic I(ξ, β). [0236] Regarding the identification characteristic I(ξ, β), when an analyzing angle β0 that makes the contribution of the micro-area elements having a normal angle ξ0 maximum is selected, the candidates can be given by solving eq. (6) in terms of β. [∂I(ξ,β)/∂ξ]ξ=ξ0=0 (6) [0237] The general arithmetic expression of eq. (4) is given by the formula 4. [ ∂ I  ( ξ , β ) ∂ ξ ] ξ = ξ 0 = 0 Formula   4 [0238] When the analyzing angle that gives ξ=0, or that gives maximum contribution of the specular reflection component is determined by eq. (6), the value of ξ becomes around −45 degrees. Also in this case, the reflection characteristics of the steel sheet adopted =28� and Δ=120�, and the azimuth of polarized light α was 45�. FIG. 48 shows the relation between the normal angle ξ to the vertical direction of micro-area element and the identification characteristic, or the weight function I(ξ,−45), in the case that the analyzing angle β is −45 degrees. For convenience of visibility, the maximum value is standardized to 1. [0239]FIG. 48 shows that the ξ=0, or the specular reflection component, is the governing angle (easy for identification), and that the specular-diffuse reflection light on micro-area elements around normal angles of ξ=�35 degrees is most difficult to be identified. Inversely, an analyzing angle β that the reflection light at ξ=�35 degrees is identified best is determined from eqs. (5) and (6), and the value of β becomes around 45 degrees. FIG. 49 shows the relation between the normal angle ξ against the analyzing angle ξ=45 degrees and the identification characteristic I (ξ,45). The curve of ξ=45 degrees is not symmetrical in right and left sides. This is a result of that, in view of incident light plane (flat plane formed by the incident light and the reflected light relating to the micro-area element), a positive value of ξ gives apparently less azimuth α of the incident polarized light, (or becomes close to p-polarized light), and that the reflectance of p-polarized light on the steel sheet is less than the reflectance of s-polarized light. FIG. 49 also shows the case of β=90� which gives an intermediate characteristic between β=−45� and 45�. [0240] As given in eq. (5), the reflected light intensity L on a micro-area element having a normal angle ξ is given by a product of the identification characteristics (weight function) I(ξ, β) and the area percentage S(ξ). Accordingly, the intensity of the light received by the light detector 116 is the integrated value of S(ξ)I(ξ, β) in terms of ξ. For example, when a reflected light on a steel sheet having the reflection characteristics shown in FIG. 50 is received through an analyzer having an analyzing angle of β=−45 degrees, the quantity of received light is the integration of the area percentage S(ξ) shown in FIG. 50 with a weight of identification characteristics I(ξ, β) shown in FIG. 48. [0241] If a pattern-like scab having characteristics shown in FIG. 39 exists, the area percentage S(ξ) becomes respective FIGS. 40(a), (b), and (c). [0242] For the case that only the specular reflection component is different as shown in FIG. 39(b) and FIG. 40(b), the light intensity on receiving that type of flaw through an analyzer having an analyzing angle β=−45 degrees corresponds to the result of integration of FIG. 40(b) multiplied by a weight function I(ξ, β) expressed by FIG. 48. Therefore, the difference in the reflected light quantity between the mother material and the scabbed portion can be detected. Regarding the analyzing angle β=45 degrees, there is no difference in the specular-diffuse reflection component, as shown in FIG. 40(b), and the difference appears only at nearby ξ=0�. Therefore, considering that the weight function I(ξ, β) at β=45� given in FIG. 49 is a low value at around β=0, the product becomes a low value over the whole range of ξ, and the difference is cancelled by integration. As a result, no difference between the mother material and the scabbed part can be detected. [0243] In the case that the difference appears only the specular-diffuse reflection component, as shown in FIG. 39(c) and FIG. 40(c), the detection cannot be attained by passing through an analyzer of −45 degrees. In that case, the detection can be done by passing through an analyzer of 45 degrees that provides high value of weight function I(ξ, β) distant from β=0�. [0244] The normal angles giving no difference in the specular-diffuse reflection component between the mother material and the scabbed portion is around ξ=�20 degrees in FIG. 40(c). If, however, there is a flaw that gives normal angle ξ nearby �30 degrees, the flaw cannot be detected even through an analyzer of 45 degrees. In that case, a separate analyzing angle (for example, ξ=90�) providing different identification characteristic is prepared, and the light is received by the third light detector. [0245] Generally, in most cases, the reflection characteristic of the mother material and scabbed portion on the surface of steel sheet falls in either one of FIGS. 33(a), (b), and (c). Accordingly, detection can be done in most cases by applying either two of the optical conditions (in this example, the analyzing angle). In a special case as described above, however, to prevent overlooking, it is preferable to use three analyzers each having different analyzing angle from each other and to receive the light by identifying the reflected light on micro-area elements having respective three normal angles. [0246] When there is a difference in both the specular reflection component and the specular-diffuse reflection component, as in the case of FIG. 39(a) and FIG. 40(a), basically the difference between the mother material and the scabbed portion can be detected only from the reflected light passed through a single analyzer. [0247] According to the present invention, an incident sheet polarizer is located covering the whole area of a linear diffusional light source, and the azimuth of the polarized light includes both the p-polarized light and the s-polarized light. Furthermore, there adopt a camera to take image via a polarizer having a polarizing angle further penetrating the specular reflection component in the regular reflection light, and a camera to take image via a polarizer having a polarizing angle further penetrating the specular-diffuse reflection component. This type of optical system conducts observation along a common light axis in the regular reflection direction, so that two kinds of signal are available corresponding to respective specular reflection and specular-diffuse reflection without being influenced by the variations of distance of steel sheet and by the variations of speed. Thus, a surface flaw inspection device that can detect pattern-like scab having no significant surface irregularity is realized. The detection range of angles for specular-diffuse reflection component is readily changed by determining the analyzing angle. [0248] Furthermore, by determining the intensity or rate of the specular reflection and the specular-diffuse reflection, changes in surface property that affect the specular reflection or the specular-diffuse reflection, other than the above-described pattern-like scab, can be detected. For example, for the surface finish of metal strip, such as dull finish and hairline finish, can be detected, in theory, if only there is a variation in distribution of micro-reflection-face, and the application to inspect that type of surface property is expected. [0249] The detection and the judgment of surface flaws may naturally apply known method and means in parallel. The detail of the parallel application of known method and means is described later. [0250] In this manner, the position of the inspection plane that is judged to have a surface flaw is tracked by a tracking means. The tracking can be conducted by calculating the time that the position of surface flaw reaches the marking means, on the basis of the transfer speed of the metal strip. The marking means applies marking on the surface of the metal strip based on the marking command generated from the tracking means. [0251] Marking can be done by various methods depending on object and use. Any kind of marking method may be applied if only the marking is readily detected in succeeding stage. For example, printing by ink or paint, stamping using a stamper, drilling using a drilling machine, change of surface roughness using grinder or the like can be applied. For the case of ferromagnetic metal strip, a magnetic marking or the like can be applied. [0252] The position of marking may be matched with the position of surface flaw, or may be matched thereto only in the longitudinal direction, not in the width direction. For example, if automatic feeding to a press-line as a material is adopted, the detection of marking may, in some cases, become easy by setting the marking position to a fixed position rather in width direction. [0253] The second aspect of the Best Mode 2 is a method for manufacturing metal strip with marking, which method comprises the steps of: identifying reflected lights coming from an inspection plane of a metal strip under two or more of optical conditions different from each other; applying judgment of presence/absence of surface flaw on the inspection plane based on a combination of reflected light components under these different optical conditions; and applying marking that indicates information relating to the flaw on the surface of the metal strip based on the judgment result. [0254] According to the second aspect of the Best Mode 2, a marking is applied to the surface of metal strip at the place where a surface flaw is judged as existing by the above-described surface flaw judging method. Since the marking to indicate the presence of surface flaw is applied, succeeding stage or user can remove the portion of the surface flaw, thus preventing the defect portion from entering the products. With the manufacturing method, the work of coil dividing to remove the surface flaw portion is significantly simplified or is eliminated, so that the production efficiency improves. [0255] The third aspect of the Best Mode 2 is a method for working metal strip comprising the steps of: identifying reflected lights coming from an inspection plane of a metal strip under two or more of optical conditions different from each other; applying judgment of presence/absence of surface flaw on the inspection plane based on a combination of reflected light components under these different optical conditions; applying marking that indicates information relating to the flaw on the surface of the metal strip; winding the marked metal strip to prepare a coil; rewinding the coil to detect marking; avoiding or removing a specific range of the metal strip based on the information given by the marking; and applying specified working to a residual portion of the metal strip after avoiding or removing the specified range. [0256] According to the third aspect of the Best Mode 2, marking is applied onto the surface of metal strip, similar with the second aspect of the Best Mode 2, and the metal strip is wound to form a coil. The coil is transported to a plant or the like, where the forming-work is applied to produce steel sheet. On applying the forming-work, the coil is unwound in advance to detect a marking by visual inspection or using a simple detector. When the marking is detected, the defect portion including the flaw on the metal strip is avoided or removed based on the information. [0257] For example, when marking is applied matching the position of flaw, the range of the defect portion is the portion applied by marking. When the marking has information of kind, degree, or the like of the flaw, the determination is given on the basis of the kind and degree of flaw which becomes a defect during the forming-work. The phrase �the defect portion including the flaw on the metal strip is avoided or removed based on the information� means that the defect portion of the metal strip is cut to remove, or the feed of the metal strip to the working stage is adjusted to pass the defect portion of the metal strip, thus controlling the feed of the metal strip to the working stage not to work the defect portion. [0258] The fourth aspect of the Best Mode 2 is a metal strip with marking having, on a portion that shows an abnormality compared with a portion of normal combination of surface reflected light components under two or more optical conditions different from each other, the marking indicating information relating to a flaw on the surface thereof. [0259] The metal strip according to the fourth aspect of the Best Mode 2 is applied with marking at a place where the above-described surface optical analysis judged as not normal, or the position of surface flaw. Accordingly, as described above, succeeding stage or user of the metal strip can remove and prevent the portion of the abnormal part from entering the products. [0260] The fifth aspect of the Best Mode 2 is a metal strip with marking having, on a portion that gives an abnormal quantity of light for one or both components of a specular reflection component on surface and a specular-diffuse reflection component on plurality of micro-area reflection surfaces, the marking indicating information relating thereto. [0261] The metal strip according to the fifth aspect of the Best Mode 2 has a marking at a position where the state of specular reflection or of specular-diffuse reflection on the surface differs from that of normal portion. The term �specular-diffuse reflection� means the plane on which plurality of micro-area specular reflection planes on which the normal faces to a specified direction are distributed. Similar with the above-described aspects, the treatment of abnormal part becomes easy with the use of the metal strip. [0262] The sixth aspect of the Best Mode 2 is a surface flaw marking device for a metal strip, described in claim 1, which marking device comprises: plurality of surface flaw inspection means including a surface flaw inspection means having a light-receiving part and a signal processing section; and a marking information preparation means that totally judges the inspection result of the surface flaw on the metal strip and prepares the marking information relating to the metal strip surface. [0263] According to the sixth aspect of the Best Mode 2, the surface flaw inspection means having the light-receiving part and the signal processing section, in the first aspect of the Best Mode 2, is combined with an ordinary surface inspection means that inspects abnormality of the surface property such as flaw and stain by detecting size and shape of flaw and stain, or reflectance of the emitted light, or the like, thus classifying the kind and degree of abnormal portions such as surface flaw. By the procedure, total judgment is given on various kinds of abnormalities in surface properties such as abnormal specular-diffuse reflection, thus the marking of the information about these abnormalities is available. [0264] The seventh aspect of the Best Mode 2 is a method for manufacturing metal strip with marking, of the second aspect of the Best Mode 2, comprises the step of applying judgment of presence/absence of surface flaw based on the inspection result using plurality of surface inspection methods which include the surface flaw inspection method that conducts the inspection on the inspection plane based on a combination of reflected light components identified under two or more of optical conditions different from each other. [0265] According to the seventh aspect of the Best Mode 2, the surface flaw inspection method combines an ordinary surface inspection means with the surface flaw inspection method, of the second aspect of the Best Mode 2, that conducts inspection of the inspection plane based on a combination of reflected light components identified under two or more of optical conditions different from each other, thus classifies the kinds and degrees of surface flaws. The �ordinary surface flaw inspection method� means, for example, the surface inspection method to inspect abnormality in the surface property such as flaw and contamination, by detecting the size and shape of flaw, the reflectance of emitted light, or the like. In this manner, total judgment is given to various kinds of surface property abnormality including abnormal specular-diffuse reflection, thus applying marking the information about these abnormal parts. [0266] The eighth aspect of the Best Mode 2 is a metal strip with marking of the fourth aspect of the Best Mode 2, comprising a metal strip with marking having, on a portion that shows an abnormality compared with a portion of normal combination of surface reflected light components under two or more optical conditions different from each other, marking indicating information relating to a flaw on the surface thereof. [0267] According to the metal strip of the eighth aspect of the Best Mode 2, adding to the abnormal part in the third aspect of the Best Mode 2, marking is applied to the surface relating to the surface inspection result or the information of various surface properties, based on the ordinary surface flaw inspection in terms of flaw size and shape, or reflectivity of emitted light, or the like. The �abnormal part� referred in the third aspect of the Best Mode 2 means the part that, when reflected lights are separated under two or more of optical conditions, as described above, the intensity or the ratio of the reflection component differs from that of the normal part. [0268] The ninth aspect of the Best Mode 2 is a metal strip with marking of the fifth aspect of the Best Mode, having, about the information relating to the metal strip surface containing a portion that gives an abnormal quantity of light for one or both components of a specular reflection component on surface and a specular-diffuse reflection component on plurality of micro-area reflection surfaces, marking is applied on the surface to indicate the information relating thereto. [0269] According to the metal strip of the ninth aspect of the Best Mode 2, adding to the abnormal part in the fifth aspect of the Best Mode 2, marking is applied to the surface relating to the surface inspection result or the information of various surface properties, based on the ordinary surface flaw inspection in terms of flaw size and shape, or reflectivity of emitted light, or the like. The �abnormal part� referred in the fourth aspect of the Best Mode 2 means the part that, as described above, the state of specular reflection or specular-diffuse reflection on the surface differs from that of normal part, and, when a reflected light is separated under two or more of polarization conditions, the intensity or the ratio of the reflection component differs from the normal part. [0270] With the above-described aspects of the Best Mode 2, the marking indicating the information about the abnormal parts of various surface flaws including abnormality in specular-diffuse reflection or about the abnormal parts of surface property is applied on the surface of metal strip. Accordingly, succeeding stage or user can notice the kind and degree of the surface flaw, thus being capable of responding to various uses and objects. [0271] Furthermore, by applying marking on the surface of metal strip, the metal strip can be wound without cutting-off the surface flaw portion and other defective portions, which prevents from increasing the number of coils by strip cutting. Since the number of coils is not increased, the coil handling does not increase the winding work. In addition, during transfer, rewinding, and working on the coils, the handling work is reduced because the number of coils is not increased. [0272]FIG. 24 shows a block diagram of an example of carrying out the present invention. A surface flaw detection device 141 identifies a light reflected from the metal strip 104 under two or more optical conditions different from each other. A signal processing section 130 judges the presence/absence of surface flaw on the inspection plane based on the combination of these reflection components. [0273] A tracking means 143 calculates the time that the position of surface flaw arrives at a marking means. That is, a sheet length calculation means 147 coverts the position of the surface flaw into the sheet length on the basis of the rotational speed determined by a rotameter 146 attached to a transfer roll 145, and converts the covered sheet length into the time necessary to arrive at a marking means 144. When thus determined time comes, the tracking means 143 generates a command signal for marking to the marking means 144. On receiving the command, the marking means 144 applies marking on the surface of the metal strip to indicate the position by printing, drilling, or the like. [0274]FIG. 25 shows an example of the metal strip with marking. According to the example, the position of a marking 149 matches the position of surface flaw 111 in longitudinal direction, and maintains a fixed position from an edge in the width direction. Accordingly, for applying in a press line, the marking 149 can be detected at a fixed position from an edge independent of the position of the surface flaw 111, and it is possible to give treatment such as rejection of a certain portion including the surface flaw 111, thus preventing the production of defective products. [0275]FIG. 26 and FIG. 27 show an example of the surface flaw detection device 141. As a linear diffusion light source 122, a transparent light-conductive rod applied with a diffuse reflection paint on a part thereof is used. A light emitted from a metal-halide light source is entered to both ends of the transparent light-conductive rod. The light coming out from the light-conductive rod of a light source 122 in diffusional mode passes through a cylindrical lens 125 and a sheet polarizer 126 with 45� polarization, then is conversed in a line with 60� of incident angle to enter over the whole width of a steel sheet 121. A reflected light 127 is further reflected by a mirror 128 located in regular reflection direction to the steel sheet, and enters camera units 129 a through d, structuring the light-receiving part. [0276] These camera units 129 a through d are arranged in the sheet width direction, as shown in FIG. 28. With that positioned mirror 128, the facility can be designed in compact size. When the mirror 128 is positioned at an adequately distant from the steel sheet 121, the mirror 128 gives a region that comes outside of the view-field of all cameras, as shown in FIG. 28, thus the mirror can be structured with divided segments. The divided mirror construction decreases the fabrication cost. [0277] Each of the camera units 129 a through d in the light-receiving part comprises three linear-array cameras 132 a through c, having respective analyzers 133 a through c with respective analyzing angles of −45�, 45�, and 90� in front of each lens, while the light axes are in parallel to each other. The offset of the view-field of these three cameras is compensated by a signal processing section 130. With the light axes kept in parallel to each other, respective individual pixels of the three cameras 132 a through c agree one-to-one to each other within the same view-field. Compared with the division of a single reflected light using a beam splitter, the method avoids loss of light quantity, and efficient measurement is available. [0278] The light-receiving range A of individual light-receiving cameras 132 a through c in each of camera units 129 a through 129 d overlaps in a part with the light-receiving range A of the corresponding light-receiving cameras 132 a through c in each of other adjacent camera units 129 a through d, as shown in FIG. 28. In other words, the light reflected from arbitrary position in the width direction on the steel sheet 121 is received by at least one of the three kinds of light-receiving cameras 132 a through c in each of the camera units 129 a through d. [0279] Instead of the linear array camera, the light-receiving part may use a two-dimensional CCD camera. In addition, the light-emitting part may use a fluorescent lamp as the linear diffusional light source 122. Furthermore, a fiber light source may be applied by arranging the light-emitting end of a bundle of fibers in a line. That is, since the light emitted from each fiber has sufficiently broad angle responding to the fiber N/A, the fiber light source arranged with the fibers substantially functions as a diffusional light source. [0280] The detail of the arrangement of plurality of cameras is described referring to FIG. 28. The plurality of camera units 129 a through dare arranged at a fixed spacing therebetween. Each of the camera units 129 a through d comprises three cameras 132 a through c which receives light under different conditions (polarization of −45�, 45�, and 90�, respectively). These cameras are arranged in parallel to each other at a fixed spacing therebetween. Accordingly, the view-field of each camera offsets by the amount of camera distance. [0281] The sequent order of camera arrangement in every camera unit is the same thereeach. For example, 45�, 90�, and −45� from left to right viewed from front side thereof. The measuring range (effective range), for example, is defined as the range that is observed under three kinds of optical conditions. And, a range where observation can be available only under one condition or only under two conditions, (range on both end portions), is concluded as ineffective, and not to be used. The camera spacing and the unit spacing are determined as a value that allows the maximum width of steel sheet to enter the measurement range (effective range). [0282] The three cameras in each unit are not adjusted to provide the same view-field. After each camera determined the flaw candidate region, each camera is adjusted in terms of each flaw candidate region. As described above, since the view-field of each camera is offset from each other, in some cases not all of these three cameras can have a view-field for a certain flaw candidate region, (or three optical conditions cannot be satisfied). In these cases, the three optical conditions are satisfied using the results of the cameras of adjacent unit. The concept is applicable not only for receiving light of three polarized lights, but also for observing under arbitrary two or more conditions by dividing the total width of inspection body into plurality of view-fields. [0283] Hereinafter the plurality of light-receiving part and the signal processing section are referred to as the flaw inspection means. Then, the surface flaw marking device shown in FIG. 24 is redrawn to FIG. 30. The flaw inspection means 140 has the light-receiving parts 132 a through c, (corresponding to the cameras in FIG. 28 and FIG. 29), and the signal processing section 130. The signal processing section 130 conducts signal processing to detect the above-described diffusion specular reflection component based on the intensity of the reflected light which is identified under different optical conditions, thus giving judgment of presence/absence of abnormal part. After that, similar with FIG. 24, the position of surface flaw is calculated using the tracking means 143 and the sheet length calculation means 147, and applies marking to the position of abnormal part using the marking means 144. [0284] As for the signal processing section, FIG. 31 shows an example of block diagram. The light intensity signals a through c coming from respective light-receiving cameras 132 a through c enter respective average value decimation parts 134 a through c, thus calculating the average value. After that, based on the pulse signals entered along with the movement by a certain distance in the longitudinal direction of the inspection body, the signal for a single line in the width direction is generated. By the decimation treatment, the resolution in the longitudinal direction is maintained to a fixed value. In addition, if the frequency of calculation of average value is regulated so as the moving distance in the longitudinal direction of the inspection body to not come outside of the view-field of the light-receiving cameras 132 a through c, overlooking can be avoided. [0285] Then, pre-treatment sections 135 a through c compensate the irregular luminance relating to signals. The irregular luminance referred herein includes that caused from optical system, that caused from reflectivity of inspection sheet. The pre-treatment sections 135 a through c detect the edge position of the steel strip and apply treatment not to mis-recognize sudden changes in signal at edge part as a flaw. [0286] The signals completed the pre-treatment enter binary calculation sections 136 a through c, where flaw candidate points are identified by comparing with preliminarily set threshold value. The identified flaw candidate points enter characteristic quantity calculation sections 137 a through c, where the signal processing for flaw judgment is conducted. In the case that the flaw candidate points are in a sequential mode, characteristic quantity calculation sections 137 a through c calculate the position and the characteristic quantity of, for example, starting address and ending address, and further the concentration characteristic quantity such as peak value. [0287] The calculated characteristic quantities enter a specular flaw judgment part 138 a or a specular diffusional flaw judgment part 138 b depending on the optical conditions (with an analyzing angle β) of the original signals a through c. The output of the characteristic quantity calculation section 137 a comes from the optical condition of original signal a as −45� analyzing (β=−45�) In this case, the characteristic quantity enters the specular flaw judgment part 138 a to detect the difference in reflected light quantity between the mother material and the scabbed portion based on the specular reflection component, as described above. [0288] On the other hand, the output of the characteristic quantity calculation sections 137 b and c come from the optical conditions of original signals b and c as 45� and 90� analyzing angles (β=45� and 90�), respectively, giving difference only on the specular-diffuse reflection component. Thus, the characteristic quantity enters the specular diffusional flaw judgment part 138 b to give flaw judgment on the specular-diffuse reflection component. [0289] Finally, a flaw total judgment section 139 gives judgment on the kind and the degree of flaw on the inspection plane of the metal strip based on the output of the specular flaw judgment section 138 a and the specular diffusional flaw judgment section 138 b. At that moment, considering the overlap of view-field between cameras 132 a through d and between camera units 129 a through d, (FIG. 29), it is preferable that the result of flaw judgment based on the signals coming from cameras of adjacent camera unit is used, at need. [0290]FIG. 32 shows an example of combination of the surface flaw inspection means that gives flaw judgment by detecting abnormality in the specular-diffuse reflection component and a surface flaw inspection means applying other method. The surface flaw inspection means 140 a is the same with that shown in FIG. 30. That is, plurality of light-receiving parts 132 a through c identify the reflected light under different optical conditions, and the signal processing section 130 detects the abnormality in the specular-diffuse reflection component to give flaw judgment. [0291] The surface flaw inspection means of other method, 140 b, may apply ordinary surface flaw inspection means such as a device with the method to give judgment by detecting surface flaw based on the size and shape of the flaw, or a device with the method to detect surface contamination and adhesion based on the reflectance of emitted light, or other variables. The surface inspection means 140 b classifies the ordinary surface flaw and abnormality in surface property in terms of the kind and the degree thereof. The marking information preparation means 142 conducts total classification and ranking on various kinds of surface flaw and abnormality in surface property, including abnormality in specular-diffuse reflection, thus preparing the information for marking. [0292] After that, the tracking means 143 and the sheet length calculation means 147 calculate the position of the surface flaw, similar with the procedure in FIG. 24. The marking means 144 applies marking to the position of abnormality based on the marking information. At that moment, preferably the information relating to the kind and degree of the surface flaw is given. The information preferably gives a detectable form expressing marking pattern, shape, strip width, or the like. If bar codes or OCR (optical character reader) are applied, further detail information can be marked. [0293] As described above, by applying marking on the surface of metal strip, increase in the number of coils is prevented, so that the work efficiency improves during the handling of coils, including transportation and recoiling. Furthermore, during the working of metal strip, the metal strip can be fed continuously without stopping at the flaw portion, so that an efficient work is expected. EMBODIMENTS [0294]FIGS. 33 and 34 show the observed results on the alloyed galvanized steel sheet in accordance with the embodiment of FIG. 26. FIG. 33 corresponds to the above-described FIG. 40(b), and FIG. 34 corresponds to FIG. 40(c). The measured flaws are the one in which the area rate in the tempered part is larger in the scabbed part than in the mother material, and the diffusional property in the non-tempered part is the same therebetween, (FIG. 40(b)), and the one in which the area rate in the tempered part gives no difference therebetween, and the diffusional property differs therebetween, (FIG. 40(c)). As for the flaw of FIG. 34 type, generally there exist angles that cannot be detected in the diffuse reflection direction. The measurement of two kinds of that type flaws, each having different angles from each other, was conducted. For comparison, the figure also shows the result of non-polarized light observation, conforming to conventional technology, on entering light with 60� of incident angle and on measuring the light from regular reflection direction (60�) and from light-receiving angle (−40�) offsetting by 20� from the incident angle. The results are summarized in Table 1. TABLE 1 Light-receiving angle in Reflection characteristics accordance with at mother material and at Undetectable angle of conventional technology Analyzing angle in embodiments scabbed part receiving light 60 −40 −45 45 90 corresponding to FIG. 40(b) −180 to 20� ◯ X ◯ X Δ corresponding to FIG. 40(c) 10 to 30, 55 to 65� X ◯ X Δ ◯ −50 to −30, 55 to 65� X X X ◯ ◯ [0295] In Table 1, the symbol ◯ designates detectable (large S/N value) and the symbol designates undetectable (small S/N value). [0296] Although the prior art adopts logic sum to receive light at two light-receiving angles and to remove noise, these flaws cannot be detected at two light-receiving angles at a time. Specifically, there are flaws that cannot be detected by either light-receiving angle. [0297] To the contrary, according to the embodiment of the present invention, identification of the reflected light components corresponding to the three different light-receiving angles is done in the regular reflection direction by using analyzer. Accordingly, one of linear-array cameras can detect the flaws. Furthermore, it is easy to set optimum analyzing angle matching with the reflection characteristics of a flaw necessary to be detected. [0298] Based on the finding that the reflection on the surface of steel sheet comprises the specular reflection component and the specular-diffuse reflection component, as described before, the present invention adopts a method to identify and grasp each component, which method comprises the steps of: using a linear diffusional light source; entering a polarized light having both p-polarized light and s-polarized light into the inspection plane; adequately setting the analyzing angle to the regular reflection direction to the steel sheet; thus identifying the component containing more of specular reflection component and the component containing more of specular-diffuse reflection component. [0299] By the method, the unobservable flaw can be detected from the specular reflection component, and the pattern-like scabs having no significant surface irregularity, which cannot be detected in prior art, can be detected without fail. In addition, since both components can be grasped on the same light axis in the regular reflection direction to the steel sheet, the measurement free from the influence of variations in steel sheet distance and of variations of speed thereof has been realized. By setting the analyzing angle, selection of identification of the specular-diffuse reflection component at arbitrary angle has become available. [0300] From the quality assurance point of view, that type of surface inspection device is absolutely required to not leave any non-detected flaw. The present invention actualizes, for the first time, the surface flaw marking device using a surface flaw inspection device that is applicable to wide fields including the surface-treated steel sheets without fail in detection of flaw, and the manufacturing of metal strips with marking. As a result, the surface flaw inspection that was relied on visual inspection of inspector is automated, and a simple means can notify the information to succeeding steps and to user. Thus, the use effect of the device and the method according to the present invention is significant. Best Mode 3 [0301] The Best Mode 3 according to the present invention is to provide a high speed response marking device that, on applying marking flaw part, singular part, or the like detected on a metallic material by an inspection device, can easily recognize the flaw and singular part during succeeding stage and during inspection at customer, that can readily apply marking using commercially available marker pen or the like independent of kind and color of the ink, and that can be used in a line which requests tracking and high speed response of marking without wearing the tip of pen by a shock of descending pen movement and without generating flaw on the marked metallic materiel, thus giving accurate marking at flaw and singular part generated on the metallic material, further assuring excellent maintenance performance and economy. [0302] The first aspect of the Best Mode 3 is a marking device to apply marking flaw and singular part on an inspection body, detected by an inspection device, which marking device comprises: a marker pen; a penholder to which the marker-pen is detachably mounted; a penholder lifting mechanism for ascending/descending the penholder together with the marker-pen; a protective cap being capable of opening/closing to protect a pen tip of the marker-pen; and a shutter mechanism to open/close the protective cap linking with the penholder lifting mechanism. [0303] The second aspect of the Best Mode 3 is a marking device for applying marking a flaw part and a singular part on a metal member, detected by an inspection device in a continuous manufacturing line of a metal material, which marking device comprises: a marker pen; a penholder to which the marker-pen is detachably mounted; a penholder lifting mechanism for ascending/descending the penholder together with the marker-pen; a protective cap being capable of opening/closing to protect a pen tip of the marker-pen; and a shutter mechanism to open/close the protective cap linking with the penholder lifting mechanism. [0304] The third aspect of the Best Mode 3 is the above-described marking device which further comprises a marking acceptance roll facing the pen tip of the marker-pen and being located at opposite side from the marking surface of the metal material being marked. [0305] The fourth aspect of the Best Mode 3 is the above-described penholder having a pressing force control mechanism for the marker-pen. [0306] The fifth aspect of the Best Mode 3 is the above-described marking device which further comprises a tracking mechanism for marking position, mounted to automatically mark a flaw part or a singular part which is detected on the metal material. [0307] The sixth aspect of the Best Mode 3 is the above-described marking device , wherein the lifting mechanism of the penholder has at least two stages of lifting mechanism covering low speed lifting and high speed lifting. [0308] The seventh aspect of the Best Mode 3 is the above-described marking device, which further comprises: an image pickup camera for photographing a marking image marked on the metal material; a lighting device for lighting the marked position; a judgment logic for judging acceptance/rejection of marking based on marking image signals photographed by the image pickup camera. [0309] The eighth aspect of the Best Mode 3 is the above-described marking device, wherein the image pickup camera takes photographs of a marking area including a flaw portion, a singular part, and an adjacent area thereof, also of an area adjacent to the marking area, thus marking possible of judging acceptance/rejection of the marking even when the tracking of marking position changes to some extent. [0310] The ninth aspect of the Best Mode 3 is the above-described marking device, wherein a monitoring device is provided to watch the output of the image pickup camera for photographing marking image. [0311] The tenth aspect of the Best Mode 3 is above-described marking device, wherein the marker-pen has a shunting function to allow for the marker-pen to shunt when a portion such as dent, burr, and welded part on the metal material, that may damage the marker-pen, passes under the marker-pen. [0312] The eleventh aspect of the Best Mode 3 is above-described marking device, which further comprises a dryer for drying marked ink after marking with the marker-pen. [0313] According to the facilities of the present invention, when a marking command is generated against a flaw, a singular part, or the like generated on a metallic material such as steel sheet, the command enters the control device. The control device tracks a range between the entering point of the marking command and the marking point. The pen cap is opened just before the specified marking point, and the marking pen is descended to a waiting position. Immediately before the marking point passes directly beneath the marking pen, the marking pen is pressed against the marking part on the metallic materiel to conduct marking. [0314] On completing the marking, the marking pen returns to the original position, and the pen cap is applied to cover the marking pen for preventing the drying thereof. Accordingly, the mechanism can be applied to a line requesting marking tracking and high speed response to assure accurate marking on flaw and singular part generated on metallic material. [0315] According to the present invention, the marking is applied not only to notify the flaw position to user but also to cover the flaw part. And the range of marking is clearly indicated so that the user can readily recognize the range of defective portion. As a result, the cut-off treatment of the defective portion is conducted without fail, which avoids troubles in succeeding stages. [0316] The marking covers the marking area covering the flaw part in terms of flaw position and length, (α1+flaw length+α2), and does not track the flaw part. The marking area information is received from a host flaw detection device to track the marking area. [0317] The mark sensor receives the marking results within a range of (α3+flaw length+α4) which is longer than the above-described range (α1+flaw length+α2), thus evaluates the percentage of the marking within the working range (α3+flaw length+α4) of the marking sensor. Consequently, judgment of good/bad marking can be given even when the flaw position tracking varies to some extent. [0318] The present invention is applicable not only to metallic materials but also to other inspection bodies including paper, film, rubber, polyvinylchloride, cloth, and the like. [0319] The following is the description of the present invention referring to the drawings. FIG. 51 is a rough vertical cross sectional view of the devices relating to the Best Mode 3 according to the present invention. FIG. 52 shows a rough plan view of the devices of FIG. 51. FIG. 53 shows a rough side view of the device of FIG. 51. As shown in these figures, the marking device 223 according to the present invention comprises: a slide table 210; a cylindrical penholder 202 supported by the slide table 210; a marker pen 204 which is detachably inserted into the penholder 202; a support plate 211; a hydraulic cylinder 205 as a penholder lifting mechanism which is mounted to the support plate 211 to lift the marker pen 204 at a high speed together with the penholder 202 using the slide table 210; a lifting motor 212 and a rack and pinion 206 as also a penholder lifting mechanism to lift the slide table 210 which is supported by the penholder 202 at a low speed along the support plate 211; a protective cap 215 having an opens/closes opening to protect the pen tip of the marker pen 204; and a shutter 208 which automatically open/close thereof linking with the hydraulic cylinder 205 as a penholder lifting mechanism and with the rack and pinion 206. [0320] The penholder 202 is in a cylindrical shape which upper end is closed and lower end is opened. The marker pen 204 is detachably inserted into the penholder 202 while projecting the pen tip 209 from the lower open edge of the penholder 202. The marker pen 204 is caught by a spring 203 attached to the upper face of the penholder 202, while the pressing force is adjusted. The marker pen 203 is a commercially available one independent of the ink color and kind, and the marker pen 203 is readily detachable. [0321] The slide table 210 to which the penholder 202 is mounted ascends/descends at a high speed by the action of the hydraulic cylinder 205 under a guide of a guide 214 formed on the support plate 211. To one end of the support plate 211, a rack 206 a is provided, which rack 206 a is caught by a pinion 206 b which is rotated by a motor 212 mounted on a body 213. Thus, the support plate 211 ascends/descends at a low speed by the rotating pinion 206 b under the guide of a guide plate 214′. [0322] As described above, both the penholder 202 and the marker pen 204 ascends/descends at low speeds by the rack and pinion 206 and at high speeds by the hydraulic cylinder 205 in total 202 steps, so that the marking action can be performed in a short time without damaging the pen tip of the marker pen 204. The lifting mechanism of the penholder may be with two steps of above-described low speed and high speed, or with three or more steps. The above-described spring 203 that catches the hydraulic cylinder 205 and the marker pen 204 by the penholder 202 also has a function of a pressing force adjusting mechanism for the marker pen 204. [0323] The protective cap 215 is in a cylindrical shape opened at upper end thereof. The inner diameter of the protective cap 215 is almost the same as the outer diameter of the penholder 202. The lower part of the penholder 202 is inserted into the marker pen 204 fitting together. At the bottom of the protective cap 215, an opening is formed to allow coming in and going out of the lower part of the penholder 202 together with the marker pen 204. To open/close the opening, a shutter 208 having an opening 208 a with nearly equal diameter with that of above-described opening is located in a manner to be horizontally movable by a shutter cylinder 207. A bushing 216 is attached to the inner periphery of the protective cap 215, and a seal 217 is attached to the periphery of the upper opening. [0324] By horizontally moving the shutter 208 using the shutter cylinder 207 to match the opening 208 a to the opening at the bottom of the protective cap 215, the pen tip 209 of the marker pen 204 can be projected from the opening 208 a of the shutter 208 together with the penholder 202. And, by closing the opening at the bottom of the protective cap 215 using the shutter 208, the pen tip 209 of the marker pen 204 can be protected. A sequence circuit includes the automatic operation of the open/close of the opening of the protective cap 215 by the shutter 208 under a link with the hydraulic cylinder 205 and the rack and pinion 206 as a penholder lifting mechanism. [0325]FIG. 51 shows a sensor 218 which confirms the ascend/descend of the penholder 202. FIG. 52 and FIG. 53 show a CCD camera 230 mounted in the body 213 to take photographs of marking images, and a lighting device 231 for the marking part. [0326]FIG. 54 illustrates a steel sheet manufacturing line provided with the devices relating to the Best Mode 3 according to the present invention. As shown in the figure, along the transfer line of the steel sheet 201 which continuously moves in the arrow direction, there are provided an inspection device 220 such as a flaw inspection device, a width inspection device, and a thickness inspection device, to detect flaw and singular part on the steel sheet 201, an entering switch 221 for the case of manual marking commanding, a marking control device 222, and a marking device 223. [0327] Beneath the marking device 23, a marking receiving roll 225 is located at opposite side to the marking face of the steel sheet 201, facing the pen tip 209 of the marker pen 204. With that type of marking receiving roll 225, wear of pen tip resulted from the shock of descending marker pen 204 and generation of flaw on the surface of the marked steel sheet 201 are prevented. [0328] The signal of flaw and singular part on the steel sheet 201 detected by the detection device 220, or the marking specification signal generated from the entering switch 221, is transmitted to the marking control device 222. The marking control device 222 receives the tracking pulse generated from the pulse generator 224 for line tracking, and tracks the position to be marked on the steel sheet 201. The marking device 223 receives the marking command which is resulted from the tracking, from the marking control device 222, thus conducts the marking to flaw or singular part of the steel sheet 201. [0329] The following is the description about the working of the facilities according to the present invention referring to FIG. 54 and FIG. 55. The marking control device 222 generates a marking waiting command at a point several meters before the marking specified place on the steel sheet 201. On receiving the waiting command, the lifting motor 212 of the marking device 223 starts to make the support plate 211 of the slide table 210 descend at a low speed by the rack and pinion 206 so as the pen tip 209 of the marker pen 204 to protrude from the opening of the protective cap 215 and to position the pen tip 209 at a waiting position, as shown in FIG. 55(b), and further the shutter cylinder 207 is automatically actuated linking therewith, thus the opening of the protective cap 215 is opened by moving the shutter 208. [0330] Next, based on the marking command generated from the marking control device 222, the hydraulic cylinder 205 starts to descend the penholder 202 to the lower limit position at a high speed, as shown in FIG. 55(c), thus applying marking on the steel sheet 1. [0331] The marking command generated from the marking control device 222 is a gate signal, and the marking is conducted during the state of gate opened. When the gate signal is released, the actuation of the hydraulic cylinder 205 makes the penholder 202 ascend to enter the waiting mode. [0332] If there comes no succeeding marking command, the lifting motor 212 is actuated to ascend the support plate 211 to which the penholder 202 is mounted to the holding position shown in FIG. 55(a), then the shutter cylinder 207 is actuated to close the opening of the protective cap 215 by the shutter 208, thus preventing the drying of pen tip 209 of the marker pen 204. [0333] Even during the series of actions, when a succeeding marking command is received, the logic of the marking control device 222 performs immediate marking. [0334] Since the marking pressing force cannot be defined to a single value owing to the variations in the state of pen tip, the state of ink filling, or the like, the pressing force is controlled by the tension adjustment of the spring 203 or the pressure adjustment of the hydraulic cylinder 205 taking into account of these states. [0335] Since blurred ink of marking is expected, a marking recognition device such as CCD camera 230 is provided. Logic to judge the acceptance/rejection of marking is provided in the marking control device 222. As the image pick up camera, above-described CCD camera, a linear-array cameras, or the like can be used. [0336]FIG. 56 is a rough sketch of the steel sheet manufacturing line provided with a drier 232 to dry the marked ink, (hereinafter referred to as the �mark ink�), immediately after applying the marking. As shown in FIG. 56, installation of the drier 232 allows to effectively drying the mark ink immediately after marking, thus preventing the ink transferring during succeeding stages. The drying is preferred to be applied immediately after marking. However, the drying may be given before or after the camera. In any case, the drying is given after marking. [0337]FIG. 57 shows the marking state on a steel sheet, comparing actual markings with the marking diagram. As shown in FIG. 57, the continuous marking line, in principle, is broken as in the cases of A1, A2, and A3, giving spacing of B2 and B3, respectively, caused from the vertical movements of traveling steel sheet and from the condition of pen tip of the marker pen 204, and, as seen in adjacent B1 and B4, the touch delay of the marker pen 204 gives thin marking or lack of marking. The zones of X1 and X2 are insensitive zones. [0338] In that situation, the marking images in the marking range H are photographed by a CCD camera, and the photograph is sent to the marking control device 222, where the acceptance/rejection of the marking is judged on the basis of the following equation. (A1+A2+A3)/{H−(X1+X2)}≧S1 [0339] where, [0340] An designates the range where the marking cannot be recognized; [0341] Bn designates the range where the marking cannot be recognized; [0342] Xn designates the insensitive zone, and Sn designates the constant for judging acceptance/rejection of the marking. [0343] The area to be marked against the actual flaw length Ld on the steel sheet is defined as (α1+flaw length+α2), and the marking gate signal is generated. [0344] On the other hand, the mark sensor gate signal has a working range of the above-given one plus α3 and α4. That is, the mark sensor gate signal is a range of actual flaw length Ld plus (α1+α2+α3+α4). [0345] To compensate the difference of surface state on the steel sheet 201, the threshold value of output signal of the CCD camera is set beginning from superior position for individual grades of the steel sheet, thus giving judgment of the acceptance/rejection of marking. The procedure is a logic to judge the acceptance/rejection of marking gate signals based on the percentages of portions excluding the insensitive parts and of marking detection parts. [0346] Although the figure does not include, a monitoring device to watch the output of CCD camera is added to the facilities to allow continuous monitoring the output of CCD camera. [0347] By adding a shunt function to the marker pen, the marker pen can avoid damage and protect the facilities by temporarily shunting the marker pen in case that special portions such as hole, curl up, welded part to damage the marker pen passes under the marker pen. [0348] The present invention is applicable not only to metallic materials but also to other inspection bodies including paper, film, rubber, polyvinylchloride, and cloth. [0349] As described above, according to the present invention, for a coil or the like which is shipped from a continuous manufacturing line of metallic materials such as steel sheets, flaw and singular part which are detected by an inspection device such as flaw inspection device, width inspection device, thickness inspection device, installed in the line, are automatically marked, thus making easy for recognizing the flaw and singular part in succeeding stage or during customer inspection, and allowing to automatic cutting off of these flaw and singular part. Furthermore, other kinds of inspection body such as paler, film, rubber, polyvinylchloride, and cloth can be applied. In addition, since commercially available marker pen is detachable at ease independent of the kind and color of ink, the facilities are superior in assuring excellent maintenance performance and economy, which provides useful effectiveness in industrial point of view. Referenced byCiting PatentFiling datePublication dateApplicantTitleUS6995838 *Dec 10, 2001Feb 7, 2006UsinorDevice for automatic surface inspection of an unwinding stripUS7560718 *Jun 30, 2006Jul 14, 2009Texmag GmbH Vertriebsgesellschaft.Method for sensing a marking on a running web of materialUS7908026 *Oct 10, 2007Mar 15, 2011Nitto Denko CorporationApparatus for testing defects of sheet-shaped product having optical film, apparatus for processing test data thereof, apparatus for cutting the same, and production thereofUS7974459 *Oct 19, 2009Jul 5, 20113M Innovative Properties CompanyApparatus and method for the automated marking of defects on webs of materialUS8078307 *Nov 10, 2010Dec 13, 2011Nitto Denko CorporationApparatus for testing defects of sheet-shaped product having optical film, apparatus for processing test data thereof, apparatus for cutting the same, and production thereofUS8175739Jul 26, 2007May 8, 20123M Innovative Properties CompanyMulti-unit process spatial synchronization* Cited by examinerClassifications U.S. Classification356/431International ClassificationB21C51/00, G01N21/89Cooperative ClassificationB21C51/005, G01N21/89European ClassificationG01N21/89, B21C51/00BLegal EventsDateCodeEventDescriptionDec 31, 2014FPAYFee paymentYear of fee payment: 8Dec 22, 2010FPAYFee paymentYear of fee payment: 4Feb 5, 2002ASAssignmentOwner name: NKK CORPORATION, JAPANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:UESUGI, MITSUAKI;YOSHIKAWA, SHOJI;INOMATA, MASAICHI;AND OTHERS;REEL/FRAME:012592/0955;SIGNING DATES FROM 20011119 TO 20011207RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services